Where possible, use palloc or pg_malloc instead; otherwise, insert
explicit NULL checks.
Generally speaking, these are places where an actual OOM is quite
unlikely, either because they're in client programs that don't
allocate all that much, or they're very early in process startup
so that we'd likely have had a fork() failure instead. Hence,
no back-patch, even though this is nominally a bug fix.
Michael Paquier, with some adjustments by me
Discussion: <CAB7nPqRu07Ot6iht9i9KRfYLpDaF2ZuUv5y_+72uP23ZAGysRg@mail.gmail.com>
The previous API for this function had it returning a malloc'd string.
That meant that callers had to check for NULL return, which few of them
were doing, and it also meant that callers had to remember to free()
the string later, which required extra logic in most cases.
Instead, make simple_prompt() write into a buffer supplied by the caller.
Anywhere that the maximum required input length is reasonably small,
which is almost all of the callers, we can just use a local or static
array as the buffer instead of dealing with malloc/free.
A fair number of callers used "pointer == NULL" as a proxy for "haven't
requested the password yet". Maintaining the same behavior requires
adding a separate boolean flag for that, which adds back some of the
complexity we save by removing free()s. Nonetheless, this nets out
at a small reduction in overall code size, and considerably less code
than we would have had if we'd added the missing NULL-return checks
everywhere they were needed.
In passing, clean up the API comment for simple_prompt() and get rid
of a very-unnecessary malloc/free in its Windows code path.
This is nominally a bug fix, but it does not seem worth back-patching,
because the actual risk of an OOM failure in any of these places seems
pretty tiny, and all of them are client-side not server-side anyway.
This patch is by me, but it owes a great deal to Michael Paquier
who identified the problem and drafted a patch for fixing it the
other way.
Discussion: <CAB7nPqRu07Ot6iht9i9KRfYLpDaF2ZuUv5y_+72uP23ZAGysRg@mail.gmail.com>
As usual, we've been pretty awful about maintaining these counts.
They're not all that critical, perhaps, but let's get them right
at release time. Also fix 9.5, which I notice is just as bad.
It's probably wrong further back, but the lack of --help=foo
options before 9.5 makes it too painful to count.
Offer a list of available versions for that extension. Formerly, since
there was no special support for this, it triggered off the UPDATE
keyword and offered a list of table names --- not too helpful.
Jeff Janes, reviewed by Gerdan Santos
Patch: <CAMkU=1z0gxEOLg2BWa69P4X4Ot8xBxipGUiGkXe_tC+raj79-Q@mail.gmail.com>
This is somewhat cosmetic, since as long as you know what you are looking
at, "10.0" is a serviceable substitute for "10". But there is a potential
for confusion between version numbers with minor numbers and those without
--- we don't want people asking "why is psql saying 10.0 when my server is
10.2". Therefore, back-patch as far as practical, which turns out to be
9.3. I could have redone the patch to use fprintf(stderr) in place of
psql_error(), but it seems more work than is warranted for branches that
will be EOL or nearly so by the time v10 comes out.
Although only psql seems to contain any code that needs this, I chose
to put the support function into fe_utils, since it seems likely we'll
need it in other client programs in future. (In 9.3-9.5, use dumputils.c,
the predecessor of fe_utils/string_utils.c.)
In HEAD, also fix the backend code that whines about loadable-library
version mismatch. I don't see much need to back-patch that.
Due to simplistic quoting and confusion of database names with conninfo
strings, roles with the CREATEDB or CREATEROLE option could escalate to
superuser privileges when a superuser next ran certain maintenance
commands. The new coding rule for PQconnectdbParams() calls, documented
at conninfo_array_parse(), is to pass expand_dbname=true and wrap
literal database names in a trivial connection string. Escape
zero-length values in appendConnStrVal(). Back-patch to 9.1 (all
supported versions).
Nathan Bossart, Michael Paquier, and Noah Misch. Reviewed by Peter
Eisentraut. Reported by Nathan Bossart.
Security: CVE-2016-5424
The decision to reuse values of parameters from a previous connection
has been based on whether the new target is a conninfo string. Add this
means of overriding that default. This feature arose as one component
of a fix for security vulnerabilities in pg_dump, pg_dumpall, and
pg_upgrade, so back-patch to 9.1 (all supported versions). In 9.3 and
later, comment paragraphs that required update had already-incorrect
claims about behavior when no connection is open; fix those problems.
Security: CVE-2016-5424
In arguments, these meta-commands wrongly treated each pair as closing
the double quoted string. Make the behavior match the documentation.
This is a compatibility break, but I more expect to find software with
untested reliance on the documented behavior than software reliant on
today's behavior. Back-patch to 9.1 (all supported versions).
Reviewed by Tom Lane and Peter Eisentraut.
Security: CVE-2016-5424
Per the fgets() specification, it cannot return without reading some data
unless it reports EOF or error. So the code here assumed that the data
buffer would necessarily be nonempty when we go to check for a newline
having been read. However, Agostino Sarubbo noticed that this could fail
to be true if the first byte of the data is a NUL (\0). The fgets() API
doesn't really work for embedded NULs, which is something I don't feel
any great need for us to worry about since we generally don't allow NULs
in SQL strings anyway. But we should not access off the end of our own
buffer if the case occurs. Normally this would just be a harmless read,
but if you were unlucky the byte before the buffer would contain '\n'
and we'd overwrite it with '\0', and if you were really unlucky that
might be valuable data and psql would crash.
Agostino reported this to pgsql-security, but after discussion we concluded
that it isn't worth treating as a security bug; if you can control the
input to psql you can do far more interesting things than just maybe-crash
it. Nonetheless, it is a bug, so back-patch to all supported versions.
Add display of proparallel (parallel-safety) when the server is >= 9.6,
and display of proacl (access privileges) for all server versions.
Minor tweak of column ordering to keep related columns together.
Michael Paquier
Discussion: <CAB7nPqTR3Vu3xKOZOYqSm-+bSZV0kqgeGAXD6w5GLbkbfd5Q6w@mail.gmail.com>
This allows the timestamps to follow local conventions (in particular,
they respond to the LC_TIME environment setting). In C locale you get
the same results as before. It seems like a good idea to do this now not
later because we already changed the format of \watch headers for 9.6.
Also, increase the buffer sizes a tad to ensure there's enough space for
translated strings.
Discussion: <20160612145532.GA22965@postgresql.kr>
This terminology provoked widespread complaints. So, instead, rename
the GUC max_parallel_degree to max_parallel_workers_per_gather
(leaving room for a possible future GUC max_parallel_workers that acts
as a system-wide limit), and rename the parallel_degree reloption to
parallel_workers. Rename structure members to match.
These changes create a dump/restore hazard for users of PostgreSQL
9.6beta1 who have set the reloption (or applied the GUC using ALTER
USER or ALTER DATABASE).
crosstabview.c was not added to nls.mk when it was added. Also remove
redundant gettext markers, since psql_error() is already registered as a
gettext keyword.
Adopt the same solution as in commit aa90e148ca, but this time
let's put the ugliness inside the write_stderr() macro, instead of
expecting each call site to deal with it. Back-port that decision
into psql/common.c where I got the macro from in the first place.
Per gripe from Peter Eisentraut.
In commit 6f0d6a507 I added a duplicate copy of psqlscanslash's identifier
downcasing code, but actually it's not hard to split that out as a callable
subroutine and avoid the duplication.
\crosstabview interpreted its arguments in an unusual way, including
doing case-insensitive matching of unquoted column names, which is
surely not the right thing. Rip that out in favor of doing something
equivalent to the dequoting/case-folding rules used by other psql
commands. To keep it simple, change the syntax so that the optional
sort column is specified as a separate argument, instead of the
also-quite-unusual syntax that attached it to the colH argument with
a colon.
Also, rework the error messages to be closer to project style.
Coverity complained about this code, not without reason because it was
rather messy. Adjust it to not scribble on the passed string; that adds
one malloc/free cycle per column name, which is going to be insignificant
in context. We can actually const-ify both the string argument and the
PGresult.
Daniel Verité, with some further cleanup by me
\crosstabview is a completely different way to display results from a
query: instead of a vertical display of rows, the data values are placed
in a grid where the column and row headers come from the data itself,
similar to a spreadsheet.
The sort order of the horizontal header can be specified by using
another column in the query, and the vertical header determines its
ordering from the order in which they appear in the query.
This only allows displaying a single value in each cell. If more than
one value correspond to the same cell, an error is thrown. Merging of
values can be done in the query itself, if necessary. This may be
revisited in the future.
Author: Daniel Verité
Reviewed-by: Pavel Stehule, Dean Rasheed
This will prevent users from creating roles which begin with "pg_" and
will check for those roles before allowing an upgrade using pg_upgrade.
This will allow for default roles to be provided at initdb time.
Reviews by José Luis Tallón and Robert Haas
The code that estimates what parallel degree should be uesd for the
scan of a relation is currently rather stupid, so add a parallel_degree
reloption that can be used to override the planner's rather limited
judgement.
Julien Rouhaud, reviewed by David Rowley, James Sewell, Amit Kapila,
and me. Some further hacking by me.
\gexec executes the just-entered query, like \g, but instead of printing
the results it takes each field as a SQL command to send to the server.
Computing a series of queries to be executed is a fairly common thing,
but up to now you always had to resort to kluges like writing the queries
to a file and then inputting the file. Now it can be done with no
intermediate step.
The implementation is fairly straightforward except for its interaction
with FETCH_COUNT. ExecQueryUsingCursor isn't capable of being called
recursively, and even if it were, its need to create a transaction
block interferes unpleasantly with the desired behavior of \gexec after
a failure of a generated query (i.e., that it can continue). Therefore,
disable use of ExecQueryUsingCursor when doing the master \gexec query.
We can still apply it to individual generated queries, however, and there
might be some value in doing so.
While testing this feature's interaction with single-step mode, I (tgl) was
led to conclude that SendQuery needs to recognize SIGINT (cancel_pressed)
as a negative response to the single-step prompt. Perhaps that's a
back-patchable bug fix, but for now I just included it here.
Corey Huinker, reviewed by Jim Nasby, Daniel Vérité, and myself
Often, upon getting an unexpected error in psql, one's first wish is that
the verbosity setting had been higher; for example, to be able to see the
schema-name field or the server code location info. Up to now the only way
has been to adjust the VERBOSITY variable and repeat the failing query.
That's a pain, and it doesn't work if the error isn't reproducible.
This commit adds a psql feature that redisplays the most recent server
error at full verbosity, without needing to make any variable changes or
re-execute the failed command. We just need to hang onto the latest error
PGresult in case the user executes \errverbose, and then apply libpq's
new PQresultVerboseErrorMessage() function to it. This will consume
some trivial amount of psql memory, but otherwise the cost when the
feature isn't used should be negligible.
Alex Shulgin, reviewed by Daniel Vérité, some improvements by me
Some of the non-MSVC Windows buildfarm members seem to need this to avoid
getting "undefined symbol" errors on libpgfeutils' references to libpq.
I could understand that if libpq were a static library, but surely it is
not? Oh well, at least the extra reference is no more harmful than it is
for libpgcommon or libpgport.
This completes (at least for now) the project of getting rid of ad-hoc
linkages among the src/bin/ subdirectories. Everything they share is now
in src/fe_utils/ and is included from a static library at link time.
A side benefit is that we can restore the FLEX_NO_BACKUP check for
psqlscanslash.l. We might need to think of another way to do that check
if we ever need to build two lexers with that property in the same source
directory, but there's no foreseeable reason to need that.
Per discussion, we want to create a static library and put the stuff into
it that until now has been shared across src/bin/ directories by ad-hoc
methods like symlinking a source file. This commit creates the library and
populates it with a couple of files that contain the widely-useful portions
of pg_dump's dumputils.c file. dumputils.c survives, because it has some
stuff that didn't seem appropriate for fe_utils, but it's significantly
smaller and is no longer referenced from any other directory.
Follow-on patches will move more stuff into fe_utils.
The Mkvcbuild.pm hacking here is just a best guess; we'll see how the
buildfarm likes it.
Now that we have src/common/ for code shared between frontend and backend,
we can get rid of (most of) the klugy ways that the keyword table and
keyword lookup code were formerly shared between different uses.
This is a first step towards a more general plan of getting rid of
special-purpose kluges for sharing code in src/bin/.
I chose to merge kwlookup.c back into keywords.c, as it once was, and
always has been so far as keywords.h is concerned. We could have
kept them separate, but there is noplace that uses ScanKeywordLookup
without also wanting access to the backend's keyword list, so there
seems little point.
ecpg is still a bit weird, but at least now the trickiness is documented.
I think that the MSVC build script should require no adjustments beyond
what's done here ... but we'll soon find out.
Instead of just "2" seconds, allow eg. "2.5" seconds. Per request
from Alvaro Herrera. No docs change since the docs didn't say you
couldn't do this already.
Include the \pset title string if there is one, and shorten the prefab
part of the header to be "timestamp (every Ns)". Per suggestion by
David Johnston.
Michael Paquier and Tom Lane
The point of this change is to use %pure-parser in pgbench's exprparse.y.
The immediate reason is that it turns out very ancient versions of bison
have a bug with the combination of a reentrant lexer and non-reentrant
parser. We could consider dropping support for such ancient bisons; but
considering that we might well need exprparse.y to be reentrant some day,
it seems better to make it so right now than to move the portability
goalposts. (AFAICT there's no particular performance consequence to this
change, either, so there's no good reason not to do it.)
Now, %pure-parser assumes that the called lexer is built with %option
bison-bridge. Because we're assuming bitwise compatibility of yyscan_t
(yyguts_t) data structures among all the psql/pgbench lexers, that
requirement propagates back to psql's lexers as well. But it's just a
few lines of change on that side too; and if psqlscan.l is to set the
baseline for a possibly-large family of lexers, it should err on the
side of including not omitting useful features.
Make some minor formatting adjustments to make it easier to diff these
files and see that they indeed implement the same flex rules (at least
to the extent that we want them to be the same).
(Someday it'd be nice to make ecpg's pgc.l more easily diff'able too,
but today is not that day.)
Also run relevant parts of these files and psqlscanslash.l through
pgindent.
No actual behavioral changes here, just obsessive neatnik-ism.
Buildfarm results show that the ability to attach pg_attribute_printf
decoration to a function pointer appeared somewhere between gcc 2.95.3
and gcc 4.0.1. Guess that it was there in 4.0.
The existing infrastructure for FLEX_NO_BACKUP doesn't work reliably
when two lexers are built in parallel in the same directory. We can
probably fix that, but as a short-term workaround, just don't make
the check for psqlscanslash.l.
Per buildfarm.
This gets us to a point where psqlscan.l can be used by other frontend
programs for the same purpose psql uses it for, ie to detect when it's
collected a complete SQL command from input that is divided across
line boundaries. Moreover, other programs can supply their own lexers
for backslash commands of their own choosing. A follow-on patch will
use this in pgbench.
The end result here is roughly the same as in Kyotaro Horiguchi's
0001-Make-SQL-parser-part-of-psqlscan-independent-from-ps.patch, although
the details of the method for switching between lexers are quite different.
Basically, in this patch we share the entire PsqlScanState, YY_BUFFER_STATE
stack, *and* yyscan_t between different lexers. The only thing we need
to do to switch to a different lexer is to make sure the start_state is
valid for the new lexer. This works because flex doesn't keep any other
persistent state that depends on the specific lexing tables generated for
a particular .l file. (We are assuming that both lexers are built with
the same flex version, or at least versions that are compatible with
respect to the contents of yyscan_t; but that doesn't seem likely to
be a big problem in practice, considering how slowly flex changes.)
Aside from being more efficient than Horiguchi-san's original solution,
this avoids possible corner-case changes in semantics: the original code
was capable of popping the input buffer stack while still staying in
backslash-related parsing states. I'm not sure that that equates to any
useful user-visible behaviors, but I'm not sure it doesn't either, so
I'm loath to assume that we only need to consider the topmost buffer when
parsing a backslash command.
I've attempted to update the MSVC build scripts for the added .l file,
but will rely on the buildfarm to see if I missed anything.
Kyotaro Horiguchi and Tom Lane
Change psqlscan.l to specify '%option reentrant', adjust internal APIs
to match, and get rid of its internal static variables. While this is
good cleanup in an abstract sense, the reason to do it right now is that
it seems the only practical way to support use of separate flex lexers
with common PsqlScanState infrastructure. If we build two non-reentrant
lexers then we are going to have problems with dangling buffer pointers
in whichever lexer isn't active when we transition from one buffer to
another, as well as curious side-effects if we try to share any code
between the files. (Horiguchi-san had a different solution to that in his
pending patch, but I find it ugly and probably broken for corner cases.)
Depending on which version of flex you're using, this may result in getting
a "warning: unused variable 'yyg'" warning from psqlscan, similar to the
one you'd have seen for a long time in backend/parser/scan.l. I put a
local -Wno-error into CFLAGS for the file, for the convenience of those
who compile with -Werror.
Also, stop compiling psqlscan as part of mainloop.c, and make it a
standalone build target instead. This is a lot cleaner than before, though
it doesn't really change much in practice as of this commit. (I'm not sure
whether the MSVC build scripts will need some help with this part, but the
buildfarm will soon tell us.)
Remove assorted external references from psqlscan.l in preparation for
making it usable by other frontend programs. This mostly involves
getting rid of direct calls to psql_error() and GetVariable() in favor
of introducing a callback-functions struct to encapsulate variable
fetching and error printing. In addition, pass the current encoding
and standard-strings status as additional parameters to psql_scan_setup
instead of looking directly at "pset" or calling additional functions.
I did not bother to change some references to psql_error that are in
functions that will soon migrate to a psql-specific backslash-command
lexer. Other than that, this version of psqlscan.l is capable of
compiling standalone. It still depends on assorted src/common functions
as well as some encoding-related libpq functions, but we expect that
all programs using it will be happy with those dependencies.
Kyotaro Horiguchi, somewhat editorialized on by me
Random .h files have no business including postgres-fe.h (or postgres.h).
If that wasn't the first #include done by the calling .c file, it's the
.c file that's broken. Noted while prepping Kyotaro Horiguchi's psql
lexer refactoring patch.
Commit a2dabf0e1d had the bright idea that it could modify a "const"
global variable if it merely casted away const from a pointer. This does
not work on platforms where the compiler puts "const" variables into
read-only storage. Depressingly, we evidently have no such platforms in
our buildfarm ... an oversight I have now remedied. (The one platform
that is known to catch this is recent OS X with -fno-common.)
Per report from Chris Ruprecht. Back-patch to 9.5 where the bogus
code was introduced.
Struct QL_HELP used to be defined as static in the sql_help.h header
file, which is included in sql_help.c and help.c, thus creating two
separate instances of the struct. This causes a warning from GCC 6,
because the struct is not used in sql_help.c.
Instead, declare the struct as extern in the header file and define it
in sql_help.c. This also allows making a bunch of functions static
because they are no longer needed outside of sql_help.c.
Reviewed-by: Thomas Munro <thomas.munro@enterprisedb.com>
The existing code confuses the byte length of the string (which is
relevant when passing it to pg_strncasecmp) with the character length
of the string (which is relevant when it is used with the SQL substring
function). Separate those two concepts.
Report and patch by Kyotaro Horiguchi, reviewed by Thomas Munro and
reviewed and further revised by me.
This field was included in the original definition of the printQueryOpt
struct in commit a45195a191, but it was not used anywhere in that
commit, nor since then. Spotted by Dickson S. Guedes.
Add
- ALTER SYSTEM SET/RESET ... -> GUC variables
- ALTER TABLE ... SET WITH -> OIDS
- ALTER DATABASE/FUNCTION/ROLE/USER ... SET/RESET -> GUC variables
- ALTER DATABASE/FUNCTION/ROLE/USER ... SET ... -> FROM CURRENT/TO
- ALTER DATABASE/FUNCTION/ROLE/USER ... SET ... TO/= -> possible values
Author: Fujii Masao
Reviewed-by: Michael Paquier, Masahiko Sawada
listForeignTables' invocation of processSQLNamePattern did not match up
with the other ones that handle potentially-schema-qualified names; it
failed to make use of pg_table_is_visible() and also passed the name
arguments in the wrong order. Bug seems to have been aboriginal in commit
0d692a0dc9. It accidentally sort of worked as long as you didn't
inquire too closely into the behavior, although the silliness was later
exposed by inconsistencies in the test queries added by 59efda3e50
(which I probably should have questioned at the time, but didn't).
Per bug #13899 from Reece Hart. Patch by Reece Hart and Tom Lane.
Back-patch to all affected branches.
Add
- ALTER FOREIGN DATA WRAPPER -> RENAME TO
- ALTER SERVER -> RENAME TO
- ALTER SERVER ... VERSION ... -> OPTIONS
- CREATE FOREIGN DATA WRAPPER -> OPTIONS
- CREATE SERVER -> OPTIONS
- CREATE|ALTER USER MAPPING -> OPTIONS
From: Andreas Karlsson <andreas@proxel.se>
The completion of CREATE INDEX CONCURRENTLY was lacking in several ways
compared to a plain CREATE INDEX command:
- CREATE INDEX <name> ON completes table names, but didn't with
CONCURRENTLY.
- CREATE INDEX completes ON and existing index names, but with
CONCURRENTLY it only completed ON.
- CREATE INDEX <name> completes ON, but didn't with CONCURRENTLY.
These are now all fixed.
The previous code supported a syntax like CREATE INDEX name
CONCURRENTLY, which never existed. Mistake introduced in commit
37ec19a15c. Remove the addition of
CONCURRENTLY at that point.
This requires adding some more infrastructure to handle both case-sensitive
and case-insensitive matching, as well as the ability to match a prefix of
a previous word. So it ends up being about a wash line-count-wise, but
it's just as big a readability win here as in the SQL tab completion rules.
Michael Paquier, some adjustments by me
In the refactoring in commit d37b816dc9,
we mostly kept to the original design whereby only the last few words
on the line were matched to identify a completable pattern. However,
after commit d854118c8d, there's really
no reason to do it like that: where it's sensible, we can use patterns
that expect to match the entire input line. And mostly, it's sensible.
Matching the entire line greatly reduces the odds of a false match that
leads to offering irrelevant completions. Moreover (though I've not
tried to measure this), it should make tab completion faster since
many of the patterns will be discarded after a single integer comparison
that finds that the wrong number of words appear on the line.
There are certain identifiable places where we still need to use
TailMatches because the statement in question is allowed to appear
embedded in a larger statement. These are just a small minority of
the existing patterns, though, so the benefit of switching where
possible is large.
It's possible that this patch has removed some within-line matching
behaviors that are in fact desirable, but we can put those back when
we get complaints. Most of the removed behaviors are certainly silly.
Michael Paquier, with some further adjustments by me
Yesterday in commit d854118c8, I had a serious brain fade leading me to
underestimate the number of words that the tab-completion logic could
divide a line into. On input such as "(((((", each character will get
seen as a separate word, which means we do indeed sometimes need more
space for the words than for the original line. Fix that.
psql offered USING, WHERE, and SET in this context, but SET is not a valid
possibility here. Seems to have been a thinko in commit f5ab0a14ea
which added DELETE's USING option.
Up to now, the tab completion logic has only examined the last few words
of the current input line; "last few" being originally as few as four
words, but lately up to nine words. Furthermore, it only looked at what
libreadline considers the current line of input, which made it rather
myopic if you split your command across lines. This was tolerable,
sort of, so long as the match patterns were only designed to consider the
last few words of input; but with the recent addition of HeadMatches()
and Matches() matching rules, we really have to do better if we want
those to behave sanely.
Hence, change the code to break the entire line down into words, and to
include any previous lines in the command buffer along with the active
readline input buffer.
This will be a little bit slower than the previous coding, but some
measurements say that even a query of several thousand characters can be
parsed in a hundred or so microseconds on modern machines; so it's really
not going to be significant for interactive tab completion. To reduce
the cost some, I arranged to avoid the per-word malloc calls that used
to occur: all the words are now kept in one malloc'd buffer.
Replace tests like
else if (pg_strcasecmp(prev4_wd, "CREATE") == 0 &&
pg_strcasecmp(prev3_wd, "TRIGGER") == 0 &&
(pg_strcasecmp(prev_wd, "BEFORE") == 0 ||
pg_strcasecmp(prev_wd, "AFTER") == 0))
with new notation like this:
else if (TailMatches4("CREATE", "TRIGGER", MatchAny, "BEFORE|AFTER"))
In addition, provide some macros COMPLETE_WITH_LISTn() to reduce the amount
of clutter needed to specify a small number of predetermined completion
alternatives.
This makes the code substantially more compact: tab-complete.c gets over a
thousand lines shorter in this patch, despite the addition of a couple of
hundred lines of infrastructure for the new notations. The new way of
specifying match rules seems a whole lot more readable and less
error-prone, too.
There's a lot more that could be done now to make matching faster and more
reliable; for example I suspect that most of the TailMatches() rules should
now be Matches() rules. That would allow them to be skipped after a single
integer comparison if there aren't the right number of words on the line,
and it would reduce the risk of unintended matches. But for now, (mostly)
refrain from reworking any match rules in favor of just converting what
we've got into the new notation.
Thomas Munro, reviewed by Michael Paquier, some adjustments by me
Previously the completion used the wrong word to match 'BY'. This was
introduced brokenly, in b2de2a. While at it, also add completion of
IN TABLESPACE ... OWNED BY and fix comments referencing nonexistent
syntax.
Reported-By: Michael Paquier
Author: Michael Paquier and Andres Freund
Discussion: CAB7nPqSHDdSwsJqX0d2XzjqOHr==HdWiubCi4L=Zs7YFTUne8w@mail.gmail.com
Backpatch: 9.4, like the commit introducing the bug
Turns out we must set rl_basic_word_break_characters *before* we call
rl_initialize() the first time, because it will quietly copy that value
elsewhere --- but only on the first call. (Love these undocumented
dependencies.) I broke this yesterday in commit 2ec477dc8108339d;
like that commit, back-patch to all active branches. Per report from
Pavel Stehule.
It emerges that libreadline doesn't notice terminal window size change
events unless they occur while collecting input. This is easy to stumble
over if you resize the window while using a pager to look at query output,
but it can be demonstrated without any pager involvement. The symptom is
that queries exceeding one line are misdisplayed during subsequent input
cycles, because libreadline has the wrong idea of the screen dimensions.
The safest, simplest way to fix this is to call rl_reset_screen_size()
just before calling readline(). That causes an extra ioctl(TIOCGWINSZ)
for every command; but since it only happens when reading from a tty, the
performance impact should be negligible. A more valid objection is that
this still leaves a tiny window during entry to readline() wherein delivery
of SIGWINCH will be missed; but the practical consequences of that are
probably negligible. In any case, there doesn't seem to be any good way to
avoid the race, since readline exposes no functions that seem safe to call
from a generic signal handler --- rl_reset_screen_size() certainly isn't.
It turns out that we also need an explicit rl_initialize() call, else
rl_reset_screen_size() dumps core when called before the first readline()
call.
rl_reset_screen_size() is not present in old versions of libreadline,
so we need a configure test for that. (rl_initialize() is present at
least back to readline 4.0, so we won't bother with a test for it.)
We would need a configure test anyway since libedit's emulation of
libreadline doesn't currently include such a function. Fortunately,
libedit seems not to have any corresponding bug.
Merlin Moncure, adjusted a bit by me
Commit d5563d7df9 drew complaints from Coverity, which quite
correctly complained that one copy of each -c or -f string was being
leaked. What's more, simple_action_list_append was allocating enough space
for still a third copy of each string as part of the SimpleActionListCell,
even though that coding method had been superseded by a separate strdup
operation. There were some other minor coding infelicities too. The
documentation needed more work as well, eg it forgot to explain that -c
causes psql not to accept any interactive input.
Complete "ALTER POLICY" with a policy name, as we do for DROP POLICY.
And, complete "ALTER POLICY polname ON" with a table name that has such
a policy, as we do for DROP POLICY, rather than with any table name
at all.
Masahiko Sawada
Commit 344cdff2c made failure to open the target of --output fatal.
For consistency, the --log-file switch should behave similarly.
Like the previous commit, back-patch to 9.5 but no further.
Daniel Verite
To support this, we must reconcile some historical anomalies in the
behavior of -c. In particular, as a backward-incompatibility, -c no
longer implies --no-psqlrc.
Pavel Stehule (code) and Catalin Iacob (documentation). Review by
Michael Paquier and myself. Proposed behavior per Tom Lane.
Formerly, if "psql -o foo" failed to open the output file "foo", it would
print an error message but then carry on as though -o had not been
specified at all. This seems contrary to expectation: a program that
cannot open its output file normally fails altogether. Make psql do
exit(1) after reporting the error.
If "\o foo" failed to open "foo", it would print an error message but then
reset the output file to stdout, as if the argument had been omitted.
This is likewise pretty surprising behavior. Make it keep the previous
output state, instead.
psql keeps SIGPIPE interrupts disabled when it is writing to a pipe, either
a pipe specified by -o/\o or a transient pipe opened for purposes such as
using a pager on query output. The logic for this was too simple and could
sometimes re-enable SIGPIPE when a -o pipe was still active, thus possibly
leading to an unexpected psql crash later.
Fixing the last point required getting rid of the kluge in PrintQueryTuples
and ExecQueryUsingCursor whereby they'd transiently change the global
queryFout state, but that seems like good cleanup anyway.
Back-patch to 9.5 but not further; these are minor-enough issues that
changing the behavior in stable branches doesn't seem appropriate.
The formatting modes that depend on knowledge of the terminal window width
did not work right when printing a query result that's been fetched in
sections (as a result of FETCH_SIZE). ExecQueryUsingCursor() would force
use of the pager as soon as there's more than one result section, and then
print.c would see an output file pointer that's not stdout and incorrectly
conclude that the terminal window width isn't relevant.
This has been broken all along for non-expanded "wrapped" output format,
and as of 9.5 the issue affects expanded mode as well. The problem also
caused "\pset expanded auto" mode to invariably *not* switch to expanded
output in a segmented result, which seems to me to be exactly backwards.
To fix, we need to pass down an "is_pager" flag to inform the print.c
subroutines that some calling level has already replaced stdout with a
pager pipe, so they should (a) not do that again and (b) nonetheless honor
the window size. (Notably, this makes the first is_pager test in
print_aligned_text() not be dead code anymore.)
This patch is a bit invasive because there are so many existing calls of
printQuery()/printTable(), but fortunately all but a couple can just pass
"false" for the added parameter.
Back-patch to 9.5 but no further. Given the lack of field complaints,
it's not clear that we should change the behavior in stable branches.
Also, the API change for printQuery()/printTable() might possibly break
third-party code, again something we don't like to do in stable branches.
However, it's not quite too late to do this in 9.5, and with the larger
scope of the problem there, it seems worth doing.
Don't force the data width to extend all the way to the right margin if it
doesn't need to. This reverts the behavior in non-wrapping cases to be
what it was in 9.4. Also, make the logic that ensures the data line width
is at least equal to the record-header line width a little less obscure.
In passing, avoid possible calculation of log10(0). Probably that's
harmless, given the lack of field complaints, but it seems risky:
conversion of NaN to an integer isn't well defined.
We should ignore output_columns unless it's greater than zero.
A zero means we couldn't get any information from ioctl(TIOCGWINSZ);
in that case the expected behavior is to print the data at native width,
not to wrap it at the smallest possible value. print_aligned_text()
gets this consideration right, but print_aligned_vertical() lost track
of this detail somewhere along the line.
This area was rather heavily whacked around in 6513633b9 and follow-on
commits, and it was showing it, because the logic to calculate the
allowable data width in wrapped expanded mode had only the vaguest
relationship to the logic that was actually printing the data. It was
not very close to being right about the conditions requiring overhead
columns to be added. Aside from being wrong, it was pretty unreadable
and under-commented. Rewrite it so it corresponds to what the printing
code actually does.
In passing, remove a couple of dead tests in the printing logic, too.
Per a complaint from Jeff Janes, though this doesn't look much like his
patch because it fixes a number of other corner-case bogosities too.
One such fix that's visible in the regression test results is that
although the code was attempting to enforce a minimum data width of
3 columns, it sometimes left less space than that available.
Previously, if no host information had been specified at connection time,
PQhost() would return NULL (unless you are on Windows, in which case you
got "localhost"). This is an unhelpful definition for a couple of reasons:
it can cause corner-case crashes in applications (cf commit c5ef8ce53d),
and there's no well-defined way for applications to find out the socket
directory path that's actually in use. As an example of the latter
problem, psql substituted DEFAULT_PGSOCKET_DIR for NULL in a couple of
places, but this is subtly wrong because it's conceivable that psql is
using a libpq shared library that was built with a different setting.
Hence, change PQhost() to return DEFAULT_PGSOCKET_DIR when appropriate,
and strip out the now-dead substitutions in psql. (There is still one
remaining reference to DEFAULT_PGSOCKET_DIR in psql, in prompt.c, which
I don't see a nice way to get rid of. But it only controls a prompt
abbreviation decision, so it seems noncritical.)
Also update the docs for PQhost, which had never previously mentioned
the possibility of a socket directory path being returned. In passing
fix the outright-incorrect code comment about PGconn.pgunixsocket.
PQhost() can return NULL in non-error situations, namely when a Unix-socket
connection has been selected by default. That behavior is a tad debatable
perhaps, but for the moment we should make sure that psql copes with it.
Unfortunately, do_connect() failed to: it could pass a NULL pointer to
strcmp(), resulting in crashes on most platforms. This was reported as a
security issue by ChenQin of Topsec Security Team, but the consensus of
the security list is that it's just a garden-variety bug with no security
implications.
For paranoia's sake, I made the keep_password test not trust PQuser or
PQport either, even though I believe those will never return NULL given
a valid PGconn.
Back-patch to all supported branches.
Fix some brain fade in commit a2dabf0e1d: erroneous variable names
in docs, rearrangements that made sentences less clear not more so,
undocumented and poorly-chosen-anyway API behaviors of subroutines,
bad grammar in error messages, copy-and-paste faults.
Albe Laurenz and Tom Lane
Once upon a time we did not have a separate CREATEROLE privilege, and
CREATEUSER effectively meant SUPERUSER. When we invented CREATEROLE
(in 8.1) we also added SUPERUSER so as to have a less confusing keyword
for this role property. However, we left CREATEUSER in place as a
deprecated synonym for SUPERUSER, because of backwards-compatibility
concerns. It's still there and is still confusing people, as for example
in bug #13694 from Justin Catterson. 9.6 will be ten years or so later,
which surely ought to be long enough to end the deprecation and just
remove these old keywords. Hence, do so.
To allow users to force RLS to always be applied, even for table owners,
add ALTER TABLE .. FORCE ROW LEVEL SECURITY.
row_security=off overrides FORCE ROW LEVEL SECURITY, to ensure pg_dump
output is complete (by default).
Also add SECURITY_NOFORCE_RLS context to avoid data corruption when
ALTER TABLE .. FORCE ROW SECURITY is being used. The
SECURITY_NOFORCE_RLS security context is used only during referential
integrity checks and is only considered in check_enable_rls() after we
have already checked that the current user is the owner of the relation
(which should always be the case during referential integrity checks).
Back-patch to 9.5 where RLS was added.
Without CASCADE, if an extension has an unfullfilled dependency on
another extension, CREATE EXTENSION ERRORs out with "required extension
... is not installed". That is annoying, especially when that dependency
is an implementation detail of the extension, rather than something the
extension's user can make sense of.
In addition to CASCADE this also includes a small set of regression
tests around CREATE EXTENSION.
Author: Petr Jelinek, editorialized by Michael Paquier, Andres Freund
Reviewed-By: Michael Paquier, Andres Freund, Jeff Janes
Discussion: 557E0520.3040800@2ndquadrant.com
Previously "GRANT * ON * TO " was tab-completed to add an extra "TO",
rather than with a list of roles. This is the bug that commit 2f88807
introduced unexpectedly. This commit fixes that incorrect tab-completion.
Thomas Munro, reviewed by Jeff Janes.
(Third time's the charm, I hope.)
Additional testing disclosed that this code could mangle already-localized
output from the "money" datatype. We can't very easily skip applying it
to "money" values, because the logic is tied to column right-justification
and people expect "money" output to be right-justified. Short of
decoupling that, we can fix it in what should be a safe enough way by
testing to make sure the string doesn't contain any characters that would
not be expected in plain numeric output.
On closer inspection, those seemingly redundant atoi() calls were not so
much inefficient as just plain wrong: the author of this code either had
not read, or had not understood, the POSIX specification for localeconv().
The grouping field is *not* a textual digit string but separate integers
encoded as chars.
We'll follow the existing code as well as the backend's cash.c in only
honoring the first group width, but let's at least honor it correctly.
This doesn't actually result in any behavioral change in any of the
locales I have installed on my Linux box, which may explain why nobody's
complained; grouping width 3 is close enough to universal that it's barely
worth considering other cases. Still, wrong is wrong, so back-patch.
This code did the wrong thing entirely for numbers with an exponent
but no decimal point (e.g., '1e6'), as reported by Jeff Janes in
bug #13636. More generally, it made lots of unverified assumptions
about what the input string could possibly look like. Rearrange so
that it only fools with leading digits that it's directly verified
are there, and an immediately adjacent decimal point. While at it,
get rid of some useless inefficiencies, like converting the grouping
count string to integer over and over (and over).
This has been broken for a long time, so back-patch to all supported
branches.
Per discussion, nowadays it is possible to have tablespaces that have
wildly different I/O characteristics from others. Setting different
effective_io_concurrency parameters for those has been measured to
improve performance.
Author: Julien Rouhaud
Reviewed by: Andres Freund
Remove the code in plpgsql that suppressed the innermost line of CONTEXT
for messages emitted by RAISE commands. That was never more than a quick
backwards-compatibility hack, and it's pretty silly in cases where the
RAISE is nested in several levels of function. What's more, it violated
our design theory that verbosity of error reports should be controlled
on the client side not the server side.
To alleviate the resulting noise increase, introduce a feature in libpq
and psql whereby the CONTEXT field of messages can be suppressed, either
always or only for non-error messages. Printing CONTEXT for errors only
is now their default behavior.
The actual code changes here are pretty small, but the effects on the
regression test outputs are widespread. I had to edit some of the
alternative expected outputs by hand; hopefully the buildfarm will soon
find anything I fat-fingered.
In passing, fix up (again) the output line counts in psql's various
help displays. Add some commentary about how to verify them.
Pavel Stehule, reviewed by Petr Jelínek, Jeevan Chalke, and others
The original implementation of TABLESAMPLE modeled the tablesample method
API on index access methods, which wasn't a good choice because, without
specialized DDL commands, there's no way to build an extension that can
implement a TSM. (Raw inserts into system catalogs are not an acceptable
thing to do, because we can't undo them during DROP EXTENSION, nor will
pg_upgrade behave sanely.) Instead adopt an API more like procedural
language handlers or foreign data wrappers, wherein the only SQL-level
support object needed is a single handler function identified by having
a special return type. This lets us get rid of the supporting catalog
altogether, so that no custom DDL support is needed for the feature.
Adjust the API so that it can support non-constant tablesample arguments
(the original coding assumed we could evaluate the argument expressions at
ExecInitSampleScan time, which is undesirable even if it weren't outright
unsafe), and discourage sampling methods from looking at invisible tuples.
Make sure that the BERNOULLI and SYSTEM methods are genuinely repeatable
within and across queries, as required by the SQL standard, and deal more
honestly with methods that can't support that requirement.
Make a full code-review pass over the tablesample additions, and fix
assorted bugs, omissions, infelicities, and cosmetic issues (such as
failure to put the added code stanzas in a consistent ordering).
Improve EXPLAIN's output of tablesample plans, too.
Back-patch to 9.5 so that we don't have to support the original API
in production.
The psql crash happened when no current connection existed. (The second
new check is optional given today's undocumented NULL argument handling
in PQhost() etc.) Back-patch to 9.0 (all supported versions).
Patch by David Rowley. Backpatch to 9.5, as some of the calls were new in
9.5, and keeping the code in sync with master makes future backpatching
easier.
Previously, INSERT with ON CONFLICT DO UPDATE specified used a new
command tag -- UPSERT. It was introduced out of concern that INSERT as
a command tag would be a misrepresentation for ON CONFLICT DO UPDATE, as
some affected rows may actually have been updated.
Alvaro Herrera noticed that the implementation of that new command tag
was incomplete; in subsequent discussion we concluded that having it
doesn't provide benefits that are in line with the compatibility breaks
it requires.
Catversion bump due to the removal of PlannedStmt->isUpsert.
Author: Peter Geoghegan
Discussion: 20150520215816.GI5885@postgresql.org
The newly added ON CONFLICT clause allows to specify an alternative to
raising a unique or exclusion constraint violation error when inserting.
ON CONFLICT refers to constraints that can either be specified using a
inference clause (by specifying the columns of a unique constraint) or
by naming a unique or exclusion constraint. DO NOTHING avoids the
constraint violation, without touching the pre-existing row. DO UPDATE
SET ... [WHERE ...] updates the pre-existing tuple, and has access to
both the tuple proposed for insertion and the existing tuple; the
optional WHERE clause can be used to prevent an update from being
executed. The UPDATE SET and WHERE clauses have access to the tuple
proposed for insertion using the "magic" EXCLUDED alias, and to the
pre-existing tuple using the table name or its alias.
This feature is often referred to as upsert.
This is implemented using a new infrastructure called "speculative
insertion". It is an optimistic variant of regular insertion that first
does a pre-check for existing tuples and then attempts an insert. If a
violating tuple was inserted concurrently, the speculatively inserted
tuple is deleted and a new attempt is made. If the pre-check finds a
matching tuple the alternative DO NOTHING or DO UPDATE action is taken.
If the insertion succeeds without detecting a conflict, the tuple is
deemed inserted.
To handle the possible ambiguity between the excluded alias and a table
named excluded, and for convenience with long relation names, INSERT
INTO now can alias its target table.
Bumps catversion as stored rules change.
Author: Peter Geoghegan, with significant contributions from Heikki
Linnakangas and Andres Freund. Testing infrastructure by Jeff Janes.
Reviewed-By: Heikki Linnakangas, Andres Freund, Robert Haas, Simon Riggs,
Dean Rasheed, Stephen Frost and many others.
This is useful to control autovacuum log volume, for situations where
monitoring only a set of tables is necessary.
Author: Michael Paquier
Reviewed by: A team led by Naoya Anzai (also including Akira Kurosawa,
Taiki Kondo, Huong Dangminh), Fujii Masao.
This is the second try at this, after fcef161729 failed miserably and
had to be reverted: as it turns out, libpq cannot depend on libpgcommon
after all. Instead of shuffling code in the master branch, make that one
just like 9.4 and accept the duplication. (This was all my own mistake,
not the patch submitter's).
psql was already accepting conninfo strings as the first parameter in
\connect, but the way it worked wasn't sane; some of the other
parameters would get the previous connection's values, causing it to
connect to a completely unexpected server or, more likely, not finding
any server at all because of completely wrong combinations of
parameters.
Fix by explicitely checking for a conninfo-looking parameter in the
dbname position; if one is found, use its complete specification rather
than mix with the other arguments. Also, change tab-completion to not
try to complete conninfo/URI-looking "dbnames" and document that
conninfos are accepted as first argument.
There was a weak consensus to backpatch this, because while the behavior
of using the dbname as a conninfo is nowhere documented for \connect, it
is reasonable to expect that it works because it does work in many other
contexts. Therefore this is backpatched all the way back to 9.0.
Author: David Fetter, Andrew Dunstan. Some editorialization by me
(probably earning a Gierth's "Sloppy" badge in the process.)
Reviewers: Andrew Gierth, Erik Rijkers, Pavel Stěhule, Stephen Frost,
Robert Haas, Andrew Dunstan.
psql was already accepting conninfo strings as the first parameter in
\connect, but the way it worked wasn't sane; some of the other
parameters would get the previous connection's values, causing it to
connect to a completely unexpected server or, more likely, not finding
any server at all because of completely wrong combinations of
parameters.
Fix by explicitely checking for a conninfo-looking parameter in the
dbname position; if one is found, use its complete specification rather
than mix with the other arguments. Also, change tab-completion to not
try to complete conninfo/URI-looking "dbnames" and document that
conninfos are accepted as first argument.
There was a weak consensus to backpatch this, because while the behavior
of using the dbname as a conninfo is nowhere documented for \connect, it
is reasonable to expect that it works because it does work in many other
contexts. Therefore this is backpatched all the way back to 9.0.
To implement this, routines previously private to libpq have been
duplicated so that psql can decide what looks like a conninfo/URI
string. In back branches, just duplicate the same code all the way back
to 9.2, where URIs where introduced; 9.0 and 9.1 have a simpler version.
In master, the routines are moved to src/common and renamed.
Author: David Fetter, Andrew Dunstan. Some editorialization by me
(probably earning a Gierth's "Sloppy" badge in the process.)
Reviewers: Andrew Gierth, Erik Rijkers, Pavel Stěhule, Stephen Frost,
Robert Haas, Andrew Dunstan.
If set, the pager will not be used unless this many lines are to be
displayed, even if that is more than the screen depth. Default is zero,
meaning it's disabled.
There is probably more work to be done in giving the user control over
when the pager is used, particularly when wide output forces use of the
pager regardless of how many lines there are, but this is a start.
This improves on commit bbfd7edae5 by
making two simple changes:
* pg_attribute_noreturn now takes parentheses, ie pg_attribute_noreturn().
Likewise pg_attribute_unused(), pg_attribute_packed(). This reduces
pgindent's tendency to misformat declarations involving them.
* attributes are now always attached to function declarations, not
definitions. Previously some places were taking creative shortcuts,
which were not merely candidates for bad misformatting by pgindent
but often were outright wrong anyway. (It does little good to put a
noreturn annotation where callers can't see it.) In any case, if
we would like to believe that these macros can be used with non-gcc
compilers, we should avoid gratuitous variance in usage patterns.
I also went through and manually improved the formatting of a lot of
declarations, and got rid of excessively repetitive (and now obsolete
anyway) comments informing the reader what pg_attribute_printf is for.
GNU readline defines the return value of write_history() as "zero if OK,
else an errno code". libedit's version of that function used to have a
different definition (to wit, "-1 if error, else the number of lines
written to the file"). We tried to work around that by checking whether
errno had become nonzero, but this method has never been kosher according
to the published API of either library. It's reportedly completely broken
in recent Ubuntu releases: psql bleats about "No such file or directory"
when saving ~/.psql_history, even though the write worked fine.
However, libedit has been following the readline definition since somewhere
around 2006, so it seems all right to finally break compatibility with
ancient libedit releases and trust that the return value is what readline
specifies. (I'm not sure when the various Linux distributions incorporated
this fix, but I did find that OS X has been shipping fixed versions since
10.5/Leopard.)
If anyone is still using such an ancient libedit, they will find that psql
complains it can't write ~/.psql_history at exit, even when the file was
written correctly. This is no worse than the behavior we're fixing for
current releases.
Back-patch to all supported branches.
While the SQL standard is pretty vague on the overall topic of operator
precedence (because it never presents a unified BNF for all expressions),
it does seem reasonable to conclude from the spec for <boolean value
expression> that OR has the lowest precedence, then AND, then NOT, then IS
tests, then the six standard comparison operators, then everything else
(since any non-boolean operator in a WHERE clause would need to be an
argument of one of these).
We were only sort of on board with that: most notably, while "<" ">" and
"=" had properly low precedence, "<=" ">=" and "<>" were treated as generic
operators and so had significantly higher precedence. And "IS" tests were
even higher precedence than those, which is very clearly wrong per spec.
Another problem was that "foo NOT SOMETHING bar" constructs, such as
"x NOT LIKE y", were treated inconsistently because of a bison
implementation artifact: they had the documented precedence with respect
to operators to their right, but behaved like NOT (i.e., very low priority)
with respect to operators to their left.
Fixing the precedence issues is just a small matter of rearranging the
precedence declarations in gram.y, except for the NOT problem, which
requires adding an additional lookahead case in base_yylex() so that we
can attach a different token precedence to NOT LIKE and allied two-word
operators.
The bulk of this patch is not the bug fix per se, but adding logic to
parse_expr.c to allow giving warnings if an expression has changed meaning
because of these precedence changes. These warnings are off by default
and are enabled by the new GUC operator_precedence_warning. It's believed
that very few applications will be affected by these changes, but it was
agreed that a warning mechanism is essential to help debug any that are.
Until now __attribute__() was defined to be empty for all compilers but
gcc. That's problematic because it prevents using it in other compilers;
which is necessary e.g. for atomics portability. It's also just
generally dubious to do so in a header as widely included as c.h.
Instead add pg_attribute_format_arg, pg_attribute_printf,
pg_attribute_noreturn macros which are implemented in the compilers that
understand them. Also add pg_attribute_noreturn and pg_attribute_packed,
but don't provide fallbacks, since they can affect functionality.
This means that external code that, possibly unwittingly, relied on
__attribute__ defined to be empty on !gcc compilers may now run into
warnings or errors on those compilers. But there shouldn't be many
occurances of that and it's hard to work around...
Discussion: 54B58BA3.8040302@ohmu.fi
Author: Oskari Saarenmaa, with some minor changes by me.
Commit 865f14a2d3 was quite a few bricks
shy of a load: psql, ecpg, and plpgsql were all left out-of-step with
the core lexer. Of these only the last was likely to be a fatal
problem; but still, a minimal amount of grepping, or even just reading
the comments adjacent to the places that were changed, would have found
the other places that needed to be changed.
This makes it possible to query for things like the SSL version and cipher
used, without depending on OpenSSL functions or macros. That is a good
thing if we ever get another SSL implementation.
PQgetssl() still works, but it should be considered as deprecated as it
only works with OpenSSL. In particular, PQgetSslInUse() should be used to
check if a connection uses SSL, because as soon as we have another
implementation, PQgetssl() will return NULL even if SSL is in use.
"ECHO all" is ignored for interactive input, and has been for a very long
time, though possibly not for as long as the documentation has claimed the
opposite. Fix that, and also note that empty lines aren't echoed, which
while dubious is another longstanding behavior (it's embedded in our
regression test files for one thing). Per bug #12721 from Hans Ginzel.
In HEAD, also improve the code comments in this area, and suppress an
unnecessary fflush(stdout) when we're not echoing. That would likely
be safe to back-patch, but I'll not risk it mere hours before a release
wrap.
