Doc: fix description of UNION/CASE/etc type unification.

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

Commit: 22e75a341ecc841bdc1db417d11a643b0a42df4f
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-08-17T19:40:07Z
Releases: 14.0
Doc: fix description of UNION/CASE/etc type unification.

The description of what select_common_type() does was not terribly
accurate.  Improve it.

David Johnston and Tom Lane

Discussion: https://postgr.es/m/1019930.1597613200@sss.pgh.pa.us

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doc/src/sgml/typeconv.sgml modified +19 −14

Documentation touched

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