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| author | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2022-10-24 12:52:43 +0200 |
|---|---|---|
| committer | Alvaro Herrera <alvherre@alvh.no-ip.org> | 2022-10-24 12:52:43 +0200 |
| commit | 3b2db22fe287d17ecb0ba4cd828dc7900dddd03f (patch) | |
| tree | 25254ec152e7c13cd94a8a6aa072b40c2e54d66f /src/backend/parser/parse_clause.c | |
| parent | 8328a15f8f95cad3fa99bbab551cade0a8403708 (diff) | |
| download | postgresql-3b2db22fe287d17ecb0ba4cd828dc7900dddd03f.tar.gz postgresql-3b2db22fe287d17ecb0ba4cd828dc7900dddd03f.zip | |
Update some comments that should've covered MERGE
Oversight in 7103ebb7aae8. Backpatch to 15.
Author: Richard Guo <guofenglinux@gmail.com>
Discussion: https://postgr.es/m/CAMbWs48gnDjZXq3-b56dVpQCNUJ5hD9kdtWN4QFwKCEapspNsA@mail.gmail.com
Diffstat (limited to 'src/backend/parser/parse_clause.c')
| -rw-r--r-- | src/backend/parser/parse_clause.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/backend/parser/parse_clause.c b/src/backend/parser/parse_clause.c index c2b5474f5f7..e01c0734d17 100644 --- a/src/backend/parser/parse_clause.c +++ b/src/backend/parser/parse_clause.c @@ -153,7 +153,7 @@ transformFromClause(ParseState *pstate, List *frmList) /* * setTargetTable - * Add the target relation of INSERT/UPDATE/DELETE to the range table, + * Add the target relation of INSERT/UPDATE/DELETE/MERGE to the range table, * and make the special links to it in the ParseState. * * We also open the target relation and acquire a write lock on it. @@ -163,7 +163,9 @@ transformFromClause(ParseState *pstate, List *frmList) * * If alsoSource is true, add the target to the query's joinlist and * namespace. For INSERT, we don't want the target to be joined to; - * it's a destination of tuples, not a source. For UPDATE/DELETE, + * it's a destination of tuples, not a source. MERGE is actually + * both, but we'll add it separately to joinlist and namespace, so + * doing nothing (like INSERT) is correct here. For UPDATE/DELETE, * we do need to scan or join the target. (NOTE: we do not bother * to check for namespace conflict; we assume that the namespace was * initially empty in these cases.) |