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## What changes were proposed in this pull request? Currently Analyzer as part of ResolveSubquery, pulls up the correlated predicates to its originating SubqueryExpression. The subquery plan is then transformed to remove the correlated predicates after they are moved up to the outer plan. In this PR, the task of pulling up correlated predicates is deferred to Optimizer. This is the initial work that will allow us to support the form of correlated subqueries that we don't support today. The design document from nsyca can be found in the following link : [DesignDoc](https://docs.google.com/document/d/1QDZ8JwU63RwGFS6KVF54Rjj9ZJyK33d49ZWbjFBaIgU/edit#) The brief description of code changes (hopefully to aid with code review) can be be found in the following link: [CodeChanges](https://docs.google.com/document/d/18mqjhL9V1An-tNta7aVE13HkALRZ5GZ24AATA-Vqqf0/edit#) ## How was this patch tested? The test case PRs were submitted earlier using. [16337](https://github.com/apache/spark/pull/16337) [16759](https://github.com/apache/spark/pull/16759) [16841](https://github.com/apache/spark/pull/16841) [16915](https://github.com/apache/spark/pull/16915) [16798](https://github.com/apache/spark/pull/16798) [16712](https://github.com/apache/spark/pull/16712) [16710](https://github.com/apache/spark/pull/16710) [16760](https://github.com/apache/spark/pull/16760) [16802](https://github.com/apache/spark/pull/16802) Author: Dilip Biswal <dbiswal@us.ibm.com> Closes #16954 from dilipbiswal/SPARK-18874. |
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