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Alexander Korotkov ad458d0cd9 Improve handling of NULLs in KNN-GiST and KNN-SP-GiST 
This commit improves subject in two ways:

 * It removes ugliness of 02f90879e7, which stores distance values and null
   flags in two separate arrays after GISTSearchItem struct.  Instead we pack
   both distance value and null flag in IndexOrderByDistance struct.  Alignment
   overhead should be negligible, because we typically deal with at most few
   "col op const" expressions in ORDER BY clause.
 * It fixes handling of "col op NULL" expression in KNN-SP-GiST.  Now, these
   expression are not passed to support functions, which can't deal with them.
   Instead, NULL result is implicitly assumed.  It future we may decide to
   teach support functions to deal with NULL arguments, but current solution is
   bugfix suitable for backpatch.

Reported-by: Nikita Glukhov
Discussion: https://postgr.es/m/826f57ee-afc7-8977-c44c-6111d18b02ec%40postgrespro.ru
Author: Nikita Glukhov
Reviewed-by: Alexander Korotkov
Backpatch-through: 9.4
2019-09-19 22:09:51 +03:00
..
attnum.h Fix various typos and grammar errors in comments. 2015-04-26 18:42:31 +02:00
brin.h Fix BRIN to use SnapshotAny during summarization 2015-08-05 16:20:50 -03:00
brin_internal.h Add BRIN infrastructure for "inclusion" opclasses 2015-05-15 18:05:22 -03:00
brin_page.h Close some holes in BRIN page assignment 2015-08-12 14:20:38 -03:00
brin_pageops.h Close some holes in BRIN page assignment 2015-08-12 14:20:38 -03:00
brin_revmap.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
brin_tuple.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
brin_xlog.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
clog.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
commit_ts.h Rename (new|old)estCommitTs to (new|old)estCommitTsXid 2015-12-28 12:35:16 -08:00
genam.h Improve handling of NULLs in KNN-GiST and KNN-SP-GiST 2019-09-19 22:09:51 +03:00
gin.h pgindent run for 9.5 2015-05-23 21:35:49 -04:00
gin_private.h Fix WAL format incompatibility introduced by backpatching of 52ac6cd2d0 2019-03-24 15:44:56 +03:00
gist.h Move strategy numbers to include/access/stratnum.h 2015-05-15 17:03:16 -03:00
gist_private.h Improve handling of NULLs in KNN-GiST and KNN-SP-GiST 2019-09-19 22:09:51 +03:00
gistscan.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
hash.h Fix building of large (bigger than shared_buffers) hash indexes. 2016-06-24 16:57:36 -04:00
heapam.h Fix logical decoding error when system table w/ toast is repeatedly rewritten. 2018-10-10 13:53:03 -07:00
heapam_xlog.h Perform a lot more sanity checks when freezing tuples. 2017-12-14 18:20:48 -08:00
hio.h Add support for INSERT ... ON CONFLICT DO NOTHING/UPDATE. 2015-05-08 05:43:10 +02:00
htup.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
htup_details.h Change some test macros to return true booleans 2017-01-18 18:06:13 -03:00
itup.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
multixact.h Remove legacy multixact truncation support. 2015-09-26 19:04:25 +02:00
nbtree.h Fix nbtree page split rmgr desc routine. 2019-09-12 15:44:59 -07:00
parallel.h Don't use bgw_main even to specify in-core bgworker entrypoints. 2017-03-31 20:50:31 -04:00
printtup.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
reloptions.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
relscan.h Fix some oversights in BRIN patch. 2015-07-21 13:38:24 -04:00
rewriteheap.h Collection of typo fixes. 2015-05-20 16:56:22 +03:00
rmgr.h Add rmgr callback to name xlog record types for display purposes. 2014-09-19 16:20:29 +02:00
rmgrlist.h Collection of typo fixes. 2015-05-20 16:56:22 +03:00
sdir.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
skey.h Move strategy numbers to include/access/stratnum.h 2015-05-15 17:03:16 -03:00
slru.h Rework the way multixact truncations work. 2015-09-26 19:04:25 +02:00
spgist.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
spgist_private.h Don't assume that 'char' is signed. 2015-07-27 21:51:49 +03:00
stratnum.h pgindent run for 9.5 2015-05-23 21:35:49 -04:00
subtrans.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
sysattr.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
timeline.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
transam.h Rename (new|old)estCommitTs to (new|old)estCommitTsXid 2015-12-28 12:35:16 -08:00
tsmapi.h Redesign tablesample method API, and do extensive code review. 2015-07-25 14:39:00 -04:00
tupconvert.h Fix ALTER TABLE / SET TYPE for irregular inheritance 2017-01-09 19:26:58 -03:00
tupdesc.h Backpatch introduction of TupleDescAttr(tupdesc, i). 2017-08-22 07:47:46 -07:00
tupmacs.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
tuptoaster.h Fix deletion of speculatively inserted TOAST on conflict 2016-08-17 17:03:36 -07:00
twophase.h Mark assorted variables PGDLLIMPORT. 2017-12-05 09:30:57 -05:00
twophase_rmgr.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
valid.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
visibilitymap.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
xact.h Propagate xactStartTimestamp and stmtStartTimestamp to parallel workers. 2018-10-06 12:00:10 -04:00
xlog.h Make checkpoint requests more robust. 2019-03-19 12:49:27 -04:00
xlog_fn.h Update copyright for 2015 2015-01-06 11:43:47 -05:00
xlog_internal.h Fix comment. 2017-08-01 08:08:47 +09:00
xlogdefs.h Introduce replication progress tracking infrastructure. 2015-04-29 19:30:53 +02:00
xloginsert.h pgindent run for 9.5 2015-05-23 21:35:49 -04:00
xlogreader.h Fix scenario where streaming standby gets stuck at a continuation record. 2018-05-05 01:35:15 +03:00
xlogrecord.h pgindent run for 9.5 2015-05-23 21:35:49 -04:00
xlogutils.h pgindent run for 9.5 2015-05-23 21:35:49 -04:00