Prior to this patch, the MCVs for text columns was not being passed to ORCA.
Hence the cardinality estimation for predicates involving text was inaccurate
and led to sub optimal plans being picked. This patch allows the MCVs to be
passed in to ORCA so that it can now estimate the cardinality using MCVs equal
and not equal operators for text columns.
Co-authored-by: NAbhijit Subramanya <asubramanya@pivotal.io>
Co-authored-by: NBhuvnesh Chaudhary <bchaudhary@pivotal.io>