wangyum opened a new pull request #25148: [SPARK-28326][SQL][TEST] Add join.sql URL: https://github.com/apache/spark/pull/25148 ## What changes were proposed in this pull request? This PR is to port numeric.sql from PostgreSQL regression tests. https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/sql/join.sql The expected results can be found in the link: https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/expected/join.out When porting the test cases, found eight PostgreSQL specific features that do not exist in Spark SQL: [SPARK-27877](https://issues.apache.org/jira/browse/SPARK-27877): ANSI SQL: LATERAL derived table(T491) [SPARK-20856](https://issues.apache.org/jira/browse/SPARK-20856): support statement using nested joins [SPARK-27987](https://issues.apache.org/jira/browse/SPARK-27987): Support POSIX Regular Expressions [SPARK-28382](https://issues.apache.org/jira/browse/SPARK-28382): Array Functions: unnest [SPARK-25411](https://issues.apache.org/jira/browse/SPARK-25411): Implement range partition in Spark [SPARK-28377](https://issues.apache.org/jira/browse/SPARK-28377): Fully support correlation names in the FROM clause [SPARK-28330](https://issues.apache.org/jira/browse/SPARK-28330): Enhance query limit [SPARK-28379](https://issues.apache.org/jira/browse/SPARK-28379): Correlated scalar subqueries must be aggregated ## How was this patch tested? N/A
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