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Commit7f9ad60

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tglsfdcpull[bot]
authored andcommitted
Avoid Assert failure when processing empty statement in aborted xact.
exec_parse_message() wants to create a cached plan in all cases,including for empty input. The empty-input path does not havea test for being in an aborted transaction, making it possiblethat plancache.c will fail due to trying to do database lookupseven though there's no real work to do.One solution would be to throw an aborted-transaction error inthis path too, but it's not entirely clear whether the lack ofsuch an error was intentional or whether some clients might berelying on non-error behavior. Instead, let's hack plancache.cso that it treats empty statements with the same logic italready had for transaction control commands, ensuring that itcan soldier through even in an already-aborted transaction.Per bug #17983 from Alexander Lakhin. Back-patch to allsupported branches.Discussion:https://postgr.es/m/17983-da4569fcb878672e@postgresql.org
1 parenta4b4b13 commit7f9ad60

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3 files changed

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lines changed

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‎src/backend/utils/cache/plancache.c

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@@ -78,9 +78,11 @@
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/*
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* We must skip "overhead" operations that involve database access when the
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* cached plan's subject statement is a transaction control command.
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* For the convenience of postgres.c, treat empty statements as control
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* commands too.
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*/
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#defineIsTransactionStmtPlan(plansource) \
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((plansource)->raw_parse_tree&& \
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((plansource)->raw_parse_tree== NULL || \
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IsA((plansource)->raw_parse_tree->stmt, TransactionStmt))
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/*

‎src/test/regress/expected/psql.out

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@@ -268,6 +268,17 @@ SELECT 3 AS x, 'Hello', 4 AS y, true AS "dirty\name" \gdesc \g
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3 | Hello | 4 | t
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(1 row)
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-- test for server bug #17983 with empty statement in aborted transaction
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set search_path = default;
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begin;
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bogus;
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ERROR: syntax error at or near "bogus"
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LINE 1: bogus;
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^
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;
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\gdesc
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The command has no result, or the result has no columns.
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rollback;
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-- \gexec
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create temporary table gexec_test(a int, b text, c date, d float);
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select format('create index on gexec_test(%I)', attname)

‎src/test/regress/sql/psql.sql

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@@ -133,6 +133,14 @@ SELECT 1 AS x, 'Hello', 2 AS y, true AS "dirty\name"
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-- all on one line
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SELECT3AS x,'Hello',4AS y, trueAS"dirty\name" \gdesc \g
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-- test for server bug #17983 with empty statement in aborted transaction
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set search_path= default;
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begin;
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bogus;
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;
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\gdesc
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rollback;
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-- \gexec
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create temporary table gexec_test(aint, btext, cdate, d float);

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