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Enhance correlated subquery cardinality estimate with stat views
Peoplesoft application extensively uses correlated subqueries on EFFDT to check that EFFDT = (SELECT MAX(EFFDT) FROM ...).
Cardinality estimations can be derived from PK, but this sometimes is not sufficient.
We need to be able to get EFFDT estimation adjusted from stat views, to allow correct cardinality estimations from parameter tables. For example, card is estimated 1/12 because 12 rows match, but in fact, with SV, there is only 1 EFFDT. So FF should be 1, not 1/12. This factor 10 leads to query plan that becomes sub-obtimal.
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