[FIXME] Wrong results on main branch for INDF query

[wenchaozhang-123]

GPDB_12_MERGE_FIXME: the following comparison query has an ORCA plan that relies on "IS NOT DISTINCT FROM" Hash Join, a variant that we likely have lost during the merge with upstream Postgres 12. Disable ORCA for this query

Issue: HASH Join(left, right, inner) removing NULL tuples when there is INDF in query.

The field hashqualclauses in HashJoin node holds the expressions "IS NOT DISTINCT FROM" that test for match. This is normally idential to hashclauses but differs in case of non-equijoin comparision.

While scanning the HashBucket we were using hashclauses so we missed the expressions with "IS NOT DISTINCT FROM".

closes: #ISSUE_Number

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