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Commit1eb9221

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Fix executor prune failure when plan already pruned
In a multi-layer partitioning setup, if at plan time all thesub-partitions are pruned but the intermediate one remains, the executorlater throws a spurious error that there's nothing to prune. That iscorrect, but there's no reason to throw an error. Therefore, don't.Reported-by: Andreas Seltenreich <seltenreich@gmx.de>Author: David Rowley <david.rowley@2ndquadrant.com>Discussion:https://postgr.es/m/87in4h98i0.fsf@ansel.ydns.eu
1 parentfa73b37 commit1eb9221

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3 files changed

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-2
lines changed

3 files changed

+37
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‎src/backend/executor/execPartition.c

Lines changed: 7 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1886,8 +1886,13 @@ find_matching_subplans_recurse(PartitionPruningData *prunedata,
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initial_prune,validsubplans);
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else
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{
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/* Shouldn't happen */
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elog(ERROR,"partition missing from subplans");
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/*
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* We get here if the planner already pruned all the sub-
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* partitions for this partition. Silently ignore this
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* partition in this case. The end result is the same: we
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* would have pruned all partitions just the same, but we
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* don't have any pruning steps to execute to verify this.
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*/
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}
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}
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}

‎src/test/regress/expected/partition_prune.out

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@@ -3570,3 +3570,21 @@ execute q (1, 1);
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reset plan_cache_mode;
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drop table p, q;
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-- Ensure run-time pruning works correctly when we match a partitioned table
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-- on the first level but find no matching partitions on the second level.
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create table listp (a int, b int) partition by list (a);
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create table listp1 partition of listp for values in(1);
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create table listp2 partition of listp for values in(2) partition by list(b);
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create table listp2_10 partition of listp2 for values in (10);
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explain (analyze, costs off, summary off, timing off)
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select * from listp where a = (select 2) and b <> 10;
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QUERY PLAN
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-------------------------------------------
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Append (actual rows=0 loops=1)
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InitPlan 1 (returns $0)
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-> Result (actual rows=1 loops=1)
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-> Seq Scan on listp1 (never executed)
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Filter: ((b <> 10) AND (a = $0))
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(5 rows)
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drop table listp;

‎src/test/regress/sql/partition_prune.sql

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Original file line numberDiff line numberDiff line change
@@ -946,3 +946,15 @@ execute q (1, 1);
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reset plan_cache_mode;
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droptable p, q;
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-- Ensure run-time pruning works correctly when we match a partitioned table
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-- on the first level but find no matching partitions on the second level.
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createtablelistp (aint, bint) partition by list (a);
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createtablelistp1 partition of listp forvaluesin(1);
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createtablelistp2 partition of listp forvaluesin(2) partition by list(b);
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createtablelistp2_10 partition of listp2 forvaluesin (10);
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explain (analyze, costs off, summary off, timing off)
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select*from listpwhere a= (select2)and b<>10;
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droptable listp;

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