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Fix MERGE's test for unreachable WHEN clauses.

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The former code would only detect an unreachable WHEN clause if it had
an AND condition. Fix, so that unreachable unconditional WHEN clauses
are also detected.

Back-patch to v15, where MERGE was added.

Discussion: https://postgr.es/m/CAEZATCVQ=7E2z4cSBB49jjeGGsB6WeoYQY32NDeSvcHiLUZ=ow@mail.gmail.com
This commit is contained in:
Dean Rasheed 2023-01-10 14:17:47 +00:00
parent d952373a98
commit f026c16a2c
3 changed files with 5 additions and 5 deletions
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6
src/backend/parser/parse_merge.c
View File

@ -155,12 +155,12 @@ transformMergeStmt(ParseState *pstate, MergeStmt *stmt)
/*
* Check for unreachable WHEN clauses
*/
if (mergeWhenClause->condition == NULL)
is_terminal[when_type] = true;
else if (is_terminal[when_type])
if (is_terminal[when_type])
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("unreachable WHEN clause specified after unconditional WHEN clause")));
if (mergeWhenClause->condition == NULL)
is_terminal[when_type] = true;
}
/*

2
src/test/regress/expected/merge.out
View File

@ -659,7 +659,7 @@ USING source AS s
ON t.tid = s.sid
WHEN MATCHED THEN /* Terminal WHEN clause for MATCHED */
DELETE
WHEN MATCHED AND s.delta > 0 THEN
WHEN MATCHED THEN
UPDATE SET balance = t.balance - s.delta;
ERROR: unreachable WHEN clause specified after unconditional WHEN clause
ROLLBACK;

2
src/test/regress/sql/merge.sql
View File

@ -438,7 +438,7 @@ USING source AS s
ON t.tid = s.sid
WHEN MATCHED THEN /* Terminal WHEN clause for MATCHED */
DELETE
WHEN MATCHED AND s.delta > 0 THEN
WHEN MATCHED THEN
UPDATE SET balance = t.balance - s.delta;
ROLLBACK;