Increase test coverage in RI_FKey_pk_upd_check_required()

Peter Eisentraut <peter@eisentraut.org>

Commit: cdaf4a472776141899dfdb742c9b73581f19f59a
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-01-16T15:56:18Z
Releases: 12.0
Increase test coverage in RI_FKey_pk_upd_check_required()

This checks the case where the primary key has at least one null
column.

Reviewed-by: Alvaro Herrera <alvherre@2ndquadrant.com>
Reviewed-by: Mi Tar <mmitar@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/7ae17c95-0c99-d420-032a-c271f510112b@2ndquadrant.com/

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