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## What changes were proposed in this pull request? This PR adds the first set of tests for EXISTS subquery. File name | Brief description ------------------------| ----------------- exists-basic.sql |Tests EXISTS and NOT EXISTS subqueries with both correlated and local predicates. exists-within-and-or.sql|Tests EXISTS and NOT EXISTS subqueries embedded in AND or OR expression. DB2 results are attached here as reference : [exists-basic-db2.txt](https://github.com/apache/spark/files/733031/exists-basic-db2.txt) [exists-and-or-db2.txt](https://github.com/apache/spark/files/733030/exists-and-or-db2.txt) ## How was this patch tested? This patch is adding tests. Author: Dilip Biswal <dbiswal@us.ibm.com> Closes #16710 from dilipbiswal/exist-basic. |
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