Fix PG community merge tests (pgmerge) #7778
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pgmerge.sql:
This is a clone of the PostgreSQL community's merge.sql test, adapted for Citus by converting tables into Citus local tables. The expectation is that any MERGE syntax that works on PostgreSQL should work on Citus as-is, utilizing our MERGE deparser.
Diffs, which primarily seem to stem from two major features in MERGE introduced by the community:
RETURNING support for MERGE
MERGE support for updatable views
Currently, Citus code does not support these features. For now, I have implemented changes to catch these cases and raise clean exceptions. With these adjustments, the pgmerge tests now pass without diffs.