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(parent: 1b9f774) | patch

Disallow merging ONLY constraints in children tables

Disallow merging ONLY constraints in children tables

When creating a child table, or when attaching an existing table as
child of another, we must not allow inheritable constraints to be
merged with non-inheritable ones, because then grandchildren would not
properly get the constraint. This would violate the grandparent's
expectations.

Bugs noted by Robert Haas.

Author: Nikhil Sontakke

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