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## What changes were proposed in this pull request? This PR is to port AGGREGATES.sql from PostgreSQL regression tests. https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/sql/aggregates.sql#L352-L605 The expected results can be found in the link: https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/expected/aggregates.out#L986-L1613 When porting the test cases, found seven PostgreSQL specific features that do not exist in Spark SQL: [SPARK-27974](https://issues.apache.org/jira/browse/SPARK-27974): Add built-in Aggregate Function: array_agg [SPARK-27978](https://issues.apache.org/jira/browse/SPARK-27978): Add built-in Aggregate Functions: string_agg [SPARK-27986](https://issues.apache.org/jira/browse/SPARK-27986): Support Aggregate Expressions with filter [SPARK-27987](https://issues.apache.org/jira/browse/SPARK-27987): Support POSIX Regular Expressions [SPARK-28682](https://issues.apache.org/jira/browse/SPARK-28682): ANSI SQL: Collation Support [SPARK-28768](https://issues.apache.org/jira/browse/SPARK-28768): Implement more text pattern operators [SPARK-28865](https://issues.apache.org/jira/browse/SPARK-28865): Table inheritance ## How was this patch tested? N/A Closes #24829 from wangyum/SPARK-27988. Authored-by: Yuming Wang <yumwang@ebay.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org> |
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