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fa117ee403
postgresql/src/include/utils
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Andres Freund fa117ee403 Allow avoiding tuple copy within tuplesort_gettupleslot(). 
Add a "copy" argument to make it optional to receive a copy of caller
tuple that is safe to use following a subsequent manipulating of
tuplesort's state.  This is a performance optimization.  Most existing
tuplesort_gettupleslot() callers are made to opt out of copying.
Existing callers that happen to rely on the validity of tuple memory
beyond subsequent manipulations of the tuplesort request their own
copy.

This brings tuplesort_gettupleslot() in line with
tuplestore_gettupleslot().  In the future, a "copy"
tuplesort_getdatum() argument may be added, that similarly allows
callers to opt out of receiving their own copy of tuple.

In passing, clarify assumptions that callers of other tuplesort fetch
routines may make about tuple memory validity, per gripe from Tom
Lane.

Author: Peter Geoghegan
Discussion: CAM3SWZQWZZ_N=DmmL7tKy_OUjGH_5mN=N=A6h7kHyyDvEhg2DA@mail.gmail.com
2017-04-06 14:48:59 -07:00
..
.gitignore Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
acl.h Implement multivariate n-distinct coefficients 2017-03-24 14:06:10 -03:00
aclchk_internal.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
array.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
arrayaccess.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
ascii.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
attoptcache.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
backend_random.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
builtins.h Collect duplicate copies of oid_cmp() 2017-03-01 11:55:28 -05:00
bytea.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
cash.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
catcache.h Fix field order in struct catcache. 2017-01-12 18:59:57 -05:00
combocid.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
date.h Remove now-dead code for !HAVE_INT64_TIMESTAMP. 2017-02-23 14:04:43 -05:00
datetime.h Remove now-dead code for !HAVE_INT64_TIMESTAMP. 2017-02-23 14:04:43 -05:00
datum.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
dsa.h Remove inclusion of postgres.h from a few header files. 2017-03-08 08:18:12 -05:00
dynahash.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
dynamic_loader.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
elog.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
evtcache.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
expandeddatum.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
fmgrtab.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
formatting.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
freepage.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
geo_decls.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
guc_tables.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
guc.h Make min_wal_size/max_wal_size use MB internally 2017-04-04 18:00:01 -04:00
help_config.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
hsearch.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
index_selfuncs.h Add optimizer and executor support for parallel index scans. 2017-02-15 13:53:24 -05:00
inet.h Add support for EUI-64 MAC addresses as macaddr8 2017-03-15 11:16:25 -04:00
int8.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
inval.h Logical replication 2017-01-20 09:04:49 -05:00
json.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
jsonapi.h Transform or iterate over json(b) string values 2017-03-31 14:25:25 -04:00
jsonb.h Introduce convenience macros to hide JsonbContainer header accesses better. 2017-01-25 13:28:38 -05:00
logtape.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
lsyscache.h Identity columns 2017-04-06 08:41:37 -04:00
memdebug.h Make useful infrastructure from aset.c generally available. 2017-02-27 03:41:44 -08:00
memutils.h Reduce size of common allocation header. 2017-02-28 19:42:44 -08:00
nabstime.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
numeric.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
palloc.h chomp PQerrorMessage() in backend uses 2017-02-27 08:54:51 -05:00
pg_crc.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
pg_locale.h Fix cpluspluscheck warning 2017-03-26 18:31:05 -04:00
pg_lsn.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
pg_rusage.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
plancache.h Fix two undocumented parameters to functions from ENR patch. 2017-04-01 15:21:05 -05:00
portal.h Add infrastructure to support EphemeralNamedRelation references. 2017-03-31 23:17:18 -05:00
ps_status.h Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
queryenvironment.h Add infrastructure to support EphemeralNamedRelation references. 2017-03-31 23:17:18 -05:00
rangetypes.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
regproc.h Move some things from builtins.h to new header files 2017-01-20 20:29:53 -05:00
rel.h Implement multivariate n-distinct coefficients 2017-03-24 14:06:10 -03:00
relcache.h Implement multivariate n-distinct coefficients 2017-03-24 14:06:10 -03:00
relfilenodemap.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
relmapper.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
relptr.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
reltrigger.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
resowner_private.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
resowner.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
rls.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
ruleutils.h Improve error reporting for tuple-routing failures. 2017-03-03 09:09:52 +05:30
sampling.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
selfuncs.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
snapmgr.h Always SnapshotResetXmin() during ClearTransaction() 2017-04-06 10:30:22 -04:00
snapshot.h Consistently declare timestamp variables as TimestampTz. 2017-02-23 15:57:08 -05:00
sortsupport.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
spccache.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
syscache.h Implement multivariate n-distinct coefficients 2017-03-24 14:06:10 -03:00
timeout.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
timestamp.h Consistently declare timestamp variables as TimestampTz. 2017-02-23 15:57:08 -05:00
tqual.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
tuplesort.h Allow avoiding tuple copy within tuplesort_gettupleslot(). 2017-04-06 14:48:59 -07:00
tuplestore.h Add infrastructure to support EphemeralNamedRelation references. 2017-03-31 23:17:18 -05:00
typcache.h Faster expression evaluation and targetlist projection. 2017-03-25 14:52:06 -07:00
tzparser.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
uuid.h Update copyright via script for 2017 2017-01-03 13:48:53 -05:00
varbit.h Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
varlena.h Move some things from builtins.h to new header files 2017-01-20 20:29:53 -05:00
xml.h Faster expression evaluation and targetlist projection. 2017-03-25 14:52:06 -07:00