This function implements the standard XMLTest function, which
converts text into xml text nodes. It uses the libxml2 function
xmlEncodeSpecialChars to escape predefined entities (&"<>), so
that those do not cause any conflict when concatenating the text
node output with existing xml documents.
This also adds a note in features.sgml about not supporting
XML(SEQUENCE). The SQL specification defines a RETURNING clause
to a set of XML functions, where RETURNING CONTENT or RETURNING
SEQUENCE can be defined. Since PostgreSQL doesn't support
XML(SEQUENCE) all of these functions operate with an
implicit RETURNING CONTENT.
Author: Jim Jones <jim.jones@uni-muenster.de>
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Discussion: https://postgr.es/m/86617a66-ec95-581f-8d54-08059cca8885@uni-muenster.de
The splitting into parts actually started earlier than the text had
claimed, but that is ancient history anyway by now and does not need
to be mentioned. Update that and tweak the text a bit.
In the wake of commit f21599311, we don't need to set table columns'
align specs retail. Undo a few such settings I'd added in commit
5545b69ae. (The column width adjustments stay, though.)
The PDF toolchain defaults to laying out all columns of a table with
equal widths, in contrast to the HTML rendering which automatically
varies the column widths to fit the data. In many places, this
results in very badly laid-out tables, with lots of useless whitespace
in some places and text that overruns its cell in other places.
For tables that have reasonably static content, we can improve
matters by adding <colspec> entries to hand-assign the column widths.
This commit does that for a few of the tables that were worst off;
it eliminates close to 200 "contents ... exceed the available area"
warnings in an A4 PDF build.
I also forced align="left" in these tables, overriding the PDF
toolchain's default which is evidently "justify". (The HTML toolchain
seems to default to that already.) Anyplace where things are tight
enough that we need to worry about this, forced justification tends to
look truly awful.
The previously listed total of 179 does not appear to be correct for
SQL:2016 anymore. (Previous SQL versions had slightly different
feature sets, so it's plausible that it was once correct.) The
currently correct count is the number of rows in the respective tables
in appendix F in SQL parts 2 and 11, minus 2 features that are listed
twice. Thus the correct count is currently 177. This also matches
the number of Core entries the built documentation currently shows, so
it's internally consistent.
Remove SQL_LANGUAGES, which was eliminated in SQL:2008, and
SQL_PACKAGES and SQL_SIZING_PROFILES, which were eliminated in
SQL:2011. Since they were dropped by the SQL standard, the
information in them was no longer updated and therefore no longer
useful.
This also removes the feature-package association information in
sql_feature_packages.txt, but for the time begin we are keeping the
information which features are in the Core package (that is, mandatory
SQL features). Maybe at some point someone wants to invent a way to
store that that does not involve using the "package" mechanism
anymore.
Discussion https://www.postgresql.org/message-id/flat/91334220-7900-071b-9327-0c6ecd012017%402ndquadrant.com
This doesn't do any remote or external things yet, but it gives modules
like plproxy and dblink a standardized and future-proof system for
managing their connection information.
Martin Pihlak and Peter Eisentraut
Standard English uses "may", "can", and "might" in different ways:
may - permission, "You may borrow my rake."
can - ability, "I can lift that log."
might - possibility, "It might rain today."
Unfortunately, in conversational English, their use is often mixed, as
in, "You may use this variable to do X", when in fact, "can" is a better
choice. Similarly, "It may crash" is better stated, "It might crash".
Also update two error messages mentioned in the documenation to match.
UNIQUE and DISTINCT predicates are both listed as implemented -- AFAIK,
neither is.
I also included another trivial patch which adds the default location
of the DSSSL stylesheets on my system (Debian unstable, docbook-dsssl
1.76) to the list of paths that configure looks for.
Neil Conway
Also implement alternative forms to expose the PostgreSQL CREATE FUNCTION
features.
Implement syntax for READ ONLY and READ WRITE clauses in SET TRANSACTION.
READ WRITE is already implemented (of course).
Implement syntax for "LIKE table" clause in CREATE TABLE. Should be fairly
easy to complete since it resembles SELECT INTO.
Implement MATCH SIMPLE clause for foreign key definitions. This is explicit
SQL99 syntax for the default behavior, so we now support it :)
Start implementation of shorthand for national character literals in
scanner. For now, just swallow the leading "N", but sometime soon let's
figure out how to pass leading type info from the scanner to the parser.
We should use the same technique for binary and hex bit string literals,
though it might be unusual to have two apparently independent literal
types fold into the same storage type.
Remove ODBC-compatible empty parentheses from calls to SQL99 functions
for which these parentheses do not match the standard.
Update the ODBC driver to ensure compatibility with the ODBC standard
for these functions (e.g. CURRENT_TIMESTAMP, CURRENT_USER, etc).
Include a new appendix in the User's Guide which lists the labeled features
for SQL99 (the labeled features replaced the "basic", "intermediate",
and "advanced" categories from SQL92). features.sgml does not yet split
this list into "supported" and "unsupported" lists.
Daniel Gustafsson
Peter Eisentraut
Tom Lane
Peter Eisentraut
Magnus Hagander
Bruce Momjian
PostgreSQL Daemon
Thomas G. Lockhart