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Doc: clarify data type behavior of COALESCE and NULLIF.

Tom Lane <tgl@sss.pgh.pa.us>

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Commit: d4fd571b3e74dc921028de0892911e49ccf800a0
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-11-09T17:02:24Z
Releases: 12.5 
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

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doc/src/sgml/func.sgml modified +25 −2
doc/src/sgml/typeconv.sgml modified +8 −4

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