Tom Lane 186cbbda8f Provide hashing support for arrays. ... The core of this patch is hash_array() and associated typcache infrastructure, which works just about exactly like the existing support for array comparison. In addition I did some work to ensure that the planner won't think that an array type is hashable unless its element type is hashable, and similarly for sorting. This includes adding a datatype parameter to op_hashjoinable and op_mergejoinable, and adding an explicit "hashable" flag to SortGroupClause. The lack of a cross-check on the element type was a pre-existing bug in mergejoin support --- but it didn't matter so much before, because if you couldn't sort the element type there wasn't any good alternative to failing anyhow. Now that we have the alternative of hashing the array type, there are cases where we can avoid a failure by being picky at the planner stage, so it's time to be picky. The issue of exactly how to combine the per-element hash values to produce an array hash is still open for discussion, but the rest of this is pretty solid, so I'll commit it as-is.		2010-10-30 21:56:11 -04:00
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adt	Provide hashing support for arrays.	2010-10-30 21:56:11 -04:00
cache	Provide hashing support for arrays.	2010-10-30 21:56:11 -04:00
error	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
fmgr	Fix comparisons of pointers with zero to compare with NULL instead.	2010-10-29 15:51:52 -04:00
hash	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
init	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
mb	Convert cvsignore to gitignore, and add .gitignore for build targets.	2010-09-22 12:57:04 +02:00
misc	Refactor typenameTypeId()	2010-10-25 21:44:49 +03:00
mmgr	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
resowner	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
sort	Eliminate some repetitive coding in tuplesort.c.	2010-10-07 20:32:21 -04:00
time	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
.gitignore	Convert cvsignore to gitignore, and add .gitignore for build targets.	2010-09-22 12:57:04 +02:00
Gen_dummy_probes.sed	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
Gen_fmgrtab.pl	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
Makefile	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
probes.d	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00