Обсуждение: pgsql: Doc: clarify data type behavior of COALESCE and NULLIF.

Doc: clarify data type behavior of COALESCE and NULLIF.

After studying the code, NULLIF is a lot more subtle than you might
have guessed.

Discussion: https://postgr.es/m/160486028730.25500.15740897403028593550@wrigleys.postgresql.org

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/24b83a5082541bdb1b333b7fcbe92f194128595c

Modified Files
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doc/src/sgml/func.sgml     | 27 +++++++++++++++++++++++++--
doc/src/sgml/typeconv.sgml | 12 ++++++++----
2 files changed, 33 insertions(+), 6 deletions(-)