wangyum opened a new pull request #24829: [WIP][SPARK-27988][SQL][TEST] Port AGGREGATES.sql [Part 3] URL: https://github.com/apache/spark/pull/24829 ## 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_BETA1/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_BETA1/src/test/regress/expected/aggregates.out#L986-L1613 When porting the test cases, found four 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 [SPARK-27987](https://issues.apache.org/jira/browse/SPARK-27987): Support POSIX Regular Expressions ## How was this patch tested? N/A
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