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Commita8cb8f1

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Fix EvalPlanQualStart to handle partitioned result rels correctly.
The es_root_result_relations array needs to be shallow-copied in thesame way as the main es_result_relations array, else EPQ rechecks onpartitioned result relations fail, as seen in bug #15677 fromNorbert Benkocs.Amit Langote, isolation test case added by meDiscussion:https://postgr.es/m/15677-0bf089579b4cd02d@postgresql.orgDiscussion:https://postgr.es/m/19321.1554567786@sss.pgh.pa.us
1 parent348f57c commita8cb8f1

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3 files changed

+42
-1
lines changed

3 files changed

+42
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lines changed

‎src/backend/executor/execMain.c

Lines changed: 13 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2779,7 +2779,7 @@ EvalPlanQualStart(EPQState *epqstate, EState *parentestate, Plan *planTree)
27792779
* es_param_exec_vals, etc.
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*
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* The ResultRelInfo array management is trickier than it looks. We
2782-
* createafresharray for the child but copy all the content from the
2782+
* create fresharrays for the child but copy all the content from the
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* parent. This is because it's okay for the child to share any
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* per-relation state the parent has already created --- but if the child
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* sets up any ResultRelInfo fields, such as its own junkfilter, that
@@ -2800,6 +2800,7 @@ EvalPlanQualStart(EPQState *epqstate, EState *parentestate, Plan *planTree)
28002800
if (parentestate->es_num_result_relations>0)
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{
28022802
intnumResultRelations=parentestate->es_num_result_relations;
2803+
intnumRootResultRels=parentestate->es_num_root_result_relations;
28032804
ResultRelInfo*resultRelInfos;
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resultRelInfos= (ResultRelInfo*)
@@ -2808,6 +2809,17 @@ EvalPlanQualStart(EPQState *epqstate, EState *parentestate, Plan *planTree)
28082809
numResultRelations*sizeof(ResultRelInfo));
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estate->es_result_relations=resultRelInfos;
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estate->es_num_result_relations=numResultRelations;
2812+
2813+
/* Also transfer partitioned root result relations. */
2814+
if (numRootResultRels>0)
2815+
{
2816+
resultRelInfos= (ResultRelInfo*)
2817+
palloc(numRootResultRels*sizeof(ResultRelInfo));
2818+
memcpy(resultRelInfos,parentestate->es_root_result_relations,
2819+
numRootResultRels*sizeof(ResultRelInfo));
2820+
estate->es_root_result_relations=resultRelInfos;
2821+
estate->es_num_root_result_relations=numRootResultRels;
2822+
}
28112823
}
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/* es_result_relation_info must NOT be copied */
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/* es_trig_target_relations must NOT be copied */

‎src/test/isolation/expected/eval-plan-qual.out

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -629,3 +629,15 @@ step multireadwcte: <... completed>
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subid id
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1 1
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starting permutation: simplepartupdate complexpartupdate c1 c2
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step simplepartupdate:
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update parttbl set a = a;
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step complexpartupdate:
638+
with u as (update parttbl set a = a returning parttbl.*)
639+
update parttbl set a = u.a from u;
640+
<waiting ...>
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step c1: COMMIT;
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step complexpartupdate: <... completed>
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step c2: COMMIT;

‎src/test/isolation/specs/eval-plan-qual.spec

Lines changed: 17 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -32,6 +32,10 @@ setup
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3333
CREATETABLEjointestASSELECTgenerate_series(1,10)ASid,0ASdata;
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CREATEINDEXONjointest(id);
35+
36+
CREATETABLEparttbl (aint)PARTITIONBYLIST (a);
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CREATETABLEparttbl1PARTITIONOFparttblFORVALUESIN (1);
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INSERTINTOparttblVALUES (1);
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}
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3741
teardown
@@ -41,6 +45,7 @@ teardown
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DROPTABLEaccounts_ext;
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DROPTABLEpCASCADE;
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DROPTABLEtable_a,table_b,jointest;
48+
DROPTABLEparttbl;
4449
}
4550

4651
session"s1"
@@ -137,6 +142,12 @@ step "selectresultforupdate"{
137142
wherejt.id=yforupdateofjt,ss1,ss2;
138143
}
139144

145+
# test for EPQ on a partitioned result table
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step"simplepartupdate"{
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updateparttblseta=a;
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}
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140151

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session"s2"
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setup{BEGINISOLATIONLEVELREADCOMMITTED; }
@@ -174,6 +185,10 @@ step "updateforcip3"{
174185
}
175186
step"wrtwcte"{UPDATEtable_aSETvalue='tableAValue2'WHEREid=1; }
176187
step"wrjt"{UPDATEjointestSETdata=42WHEREid=7; }
188+
step"complexpartupdate"{
189+
withuas (updateparttblseta=areturningparttbl.*)
190+
updateparttblseta=u.afromu;
191+
}
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# Use writable CTEs to create self-updated rows, that then are
179194
# (updated|deleted). The *fail versions of the tests additionally
@@ -261,3 +276,5 @@ permutation "wrtwcte" "readwcte" "c1" "c2"
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permutation"wrjt""selectjoinforupdate""c2""c1"
262277
permutation"wrjt""selectresultforupdate""c2""c1"
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permutation"wrtwcte""multireadwcte""c1""c2"
279+
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permutation"simplepartupdate""complexpartupdate""c1""c2"

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