[HACKERS] AT detach partition is broken - Mailing list pgsql-hackers

I noticed that running ALTER TABLE table_name DETACH PARTITION crashes, if
table_name is not a partitioned table.  That's because of an  Assert in
ATExecDetachPartition().  We really should error out much sooner in this
case, IOW during transformAlterTableStmt(), as is done in the case of
ATTACH PARTITION.

Attached patch fixes that.

Thanks,
Amit

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