xuanyuanking opened a new pull request #26763: [SPARK-30125][SQL] Remove PostgreSQL dialect URL: https://github.com/apache/spark/pull/26763 ### What changes were proposed in this pull request? Revert all PostgreSQL dialect related PRs. ### Why are the changes needed? As the discussion in http://apache-spark-developers-list.1001551.n3.nabble.com/DISCUSS-PostgreSQL-dialect-td28417.html, we need to remove PostgreSQL dialect form code base for several reasons: 1. The current approach makes the codebase complicated and hard to maintain. 2. Fully migrating PostgreSQL workloads to Spark SQL is not our focus for now. ### Does this PR introduce any user-facing change? Yes, the config `spark.sql.dialect` will be removed. ### How was this patch tested? Existing UT.
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