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Revert b6002a796

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This removes "Add Result Cache executor node".  It seems that something
weird is going on with the tracking of cache hits and misses as
highlighted by many buildfarm animals.  It's not yet clear what the
problem is as other parts of the plan indicate that the cache did work
correctly, it's just the hits and misses that were being reported as 0.

This is especially a bad time to have the buildfarm so broken, so
reverting before too many more animals go red.

Discussion: https://postgr.es/m/CAApHDvq_hydhfovm4=izgWs+C5HqEeRScjMbOgbpC-jRAeK3Yw@mail.gmail.com
This commit is contained in:
David Rowley
2021-04-01 13:33:23 +13:00
parent b6002a796d
commit 28b3e3905c
45 changed files with 196 additions and 2833 deletions
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41
src/backend/optimizer/plan/initsplan.c
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@ -33,7 +33,6 @@
#include "parser/analyze.h"
#include "rewrite/rewriteManip.h"
#include "utils/lsyscache.h"
#include "utils/typcache.h"
/* These parameters are set by GUC */
int from_collapse_limit;
@ -78,7 +77,6 @@ static bool check_equivalence_delay(PlannerInfo *root,
static bool check_redundant_nullability_qual(PlannerInfo *root, Node *clause);
static void check_mergejoinable(RestrictInfo *restrictinfo);
static void check_hashjoinable(RestrictInfo *restrictinfo);
static void check_resultcacheable(RestrictInfo *restrictinfo);
/*****************************************************************************
@ -2210,13 +2208,6 @@ distribute_restrictinfo_to_rels(PlannerInfo *root,
*/
check_hashjoinable(restrictinfo);
/*
* Likewise, check if the clause is suitable to be used with a
* Result Cache node to cache inner tuples during a parameterized
* nested loop.
*/
check_resultcacheable(restrictinfo);
/*
* Add clause to the join lists of all the relevant relations.
*/
@ -2459,7 +2450,6 @@ build_implied_join_equality(PlannerInfo *root,
/* Set mergejoinability/hashjoinability flags */
check_mergejoinable(restrictinfo);
check_hashjoinable(restrictinfo);
check_resultcacheable(restrictinfo);
return restrictinfo;
}
@ -2707,34 +2697,3 @@ check_hashjoinable(RestrictInfo *restrictinfo)
!contain_volatile_functions((Node *) restrictinfo))
restrictinfo->hashjoinoperator = opno;
}
/*
* check_resultcacheable
* If the restrictinfo's clause is suitable to be used for a Result Cache
* node, set the hasheqoperator to the hash equality operator that will be
* needed during caching.
*/
static void
check_resultcacheable(RestrictInfo *restrictinfo)
{
TypeCacheEntry *typentry;
Expr *clause = restrictinfo->clause;
Node *leftarg;
if (restrictinfo->pseudoconstant)
return;
if (!is_opclause(clause))
return;
if (list_length(((OpExpr *) clause)->args) != 2)
return;
leftarg = linitial(((OpExpr *) clause)->args);
typentry = lookup_type_cache(exprType(leftarg), TYPECACHE_HASH_PROC |
TYPECACHE_EQ_OPR);
if (!OidIsValid(typentry->hash_proc) || !OidIsValid(typentry->eq_opr))
return;
restrictinfo->hasheqoperator = typentry->eq_opr;
}