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## What changes were proposed in this pull request? This PR is to port union.sql from PostgreSQL regression tests. https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/sql/union.sql The expected results can be found in the link: https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/expected/union.out When porting the test cases, found four PostgreSQL specific features that do not exist in Spark SQL: [SPARK-28409](https://issues.apache.org/jira/browse/SPARK-28409): SELECT FROM syntax [SPARK-28298](https://issues.apache.org/jira/browse/SPARK-28298): Fully support char and varchar types [SPARK-28557](https://issues.apache.org/jira/browse/SPARK-28557): Support empty select list [SPARK-27767](https://issues.apache.org/jira/browse/SPARK-27767): Built-in function: generate_series ## How was this patch tested? N/A Closes #25163 from wangyum/SPARK-28406. Authored-by: Yuming Wang <yumwang@ebay.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com> |
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