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author	Tom Lane <tgl@sss.pgh.pa.us>
	Mon, 9 May 2022 18:15:37 +0000 (14:15 -0400)
committer	Tom Lane <tgl@sss.pgh.pa.us>
	Mon, 9 May 2022 18:15:37 +0000 (14:15 -0400)
commit	90e52884edf75b86c2832e6094d30eb2987d23a2
tree	fe10f29163ecb5699e47977b2e2aba6d9a9cece9	tree \| snapshot
parent	5045c795301d6332660053f0b4194adac03a6db5	commit \| diff

Fix core dump in transformValuesClause when there are no columns.

The parser code that transformed VALUES from row-oriented to
column-oriented lists failed if there were zero columns.
You can't write that straightforwardly (though probably you
should be able to), but the case can be reached by expanding
a "tab.*" reference to a zero-column table.

Per bug #17477 from Wang Ke. Back-patch to all supported branches.

Discussion: https://postgr.es/m/17477-0af3c6ac6b0a6ae0@postgresql.org

src/backend/parser/analyze.c		diff \| blob \| blame \| history
src/test/regress/expected/select.out		diff \| blob \| blame \| history
src/test/regress/sql/select.sql		diff \| blob \| blame \| history

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