peter-toth opened a new pull request #24860: [WIP][SPARK-28034][SQL] Port with.sql URL: https://github.com/apache/spark/pull/24860 ## What changes were proposed in this pull request? This PR is to port with.sql from PostgreSQL regression tests. https://github.com/postgres/postgres/blob/REL_12_BETA1/src/test/regress/sql/with.sql The expected results can be found in the link: https://github.com/postgres/postgres/blob/REL_12_BETA1/src/test/regress/expected/with.out When porting the test cases, found ??? PostgreSQL specific features that do not exist in Spark SQL: - [SPARK-19799](https://issues.apache.org/jira/browse/SPARK-19799): Support WITH clause in subqueries - [SPARK-28002](https://issues.apache.org/jira/browse/SPARK-28002): Support WITH clause column aliases - [SPARK-24497](https://issues.apache.org/jira/browse/SPARK-24497): Support recursive SQL query - [SPARK-???]: Support union combinator in recursive SQL query - [SPARK-???]: Support recursive SQL view - [SPARK-???]: Support IS OF type predicate ## How was this patch tested? N/A
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