Major Description
In SPARK-17075, we estimate cardinality of predicate expression "column (op) literal", where op is =, <, <=, >, >= or <=>. In SQL queries, we also see predicate expressions involving two columns such as "column-1 (op) column-2" where column-1 and column-2 belong to same table. Note that, if column-1 and column-2 belong to different tables, then it is a join operator's work, NOT a filter operator's work.
In this jira, we want to estimate the filter factor of predicate expressions involving two columns of same table. For example, multiple tpc-h queries have this kind of predicate "WHERE l_commitdate < l_receiptdate".
