peter-toth opened a new pull request #25029: [WIP][SPARK-28228][SQL] Better support for WITH clause URL: https://github.com/apache/spark/pull/25029 ## What changes were proposed in this pull request? This PR adds compatibility of handling a `WITH` clause within another `WITH` cause. Before this PR these queries retuned `1` while after this PR they return `2` as PostgreSQL does: ``` WITH t AS (SELECT 1), t2 AS ( WITH t AS (SELECT 2) SELECT * FROM t ) SELECT * FROM t2 ``` ``` WITH t AS (SELECT 1) SELECT ( WITH t AS (SELECT 2) SELECT * FROM t ) ``` As this is an incompatible change, the PR introduces the `spark.sql.legacy.cte.substitution.enabled` flag as an option to restore old behaviour. ## How was this patch tested? Added new UTs.
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