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fca6cabed1
My commit 3de241dba8 introduced some code to create a clone of a
foreign key to a partition, but I put it in pg_constraint.c because it
was too close to the contents of the pg_constraint row. With the
previous commit that split out the constraint tuple deconstruction into
its own routine, it makes more sense to have the FK-cloning function in
tablecmds.c, mostly because its static subroutine can then be used by a
future bugfix.
My initial posting of this patch had this routine as static in
tablecmds.c, but sadly this function is already part of the Postgres 11
ABI as exported from pg_constraint.c, so keep it as exported also just
to avoid breaking any possible users of it.
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