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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/10/19 07:00:56 UTC

[GitHub] [spark] LuciferYang commented on pull request #24809: [SPARK-21136][SQL] Disallow FROM-only statements and show better warnings for Hive-style single-from statements

LuciferYang commented on pull request #24809:
URL: https://github.com/apache/spark/pull/24809#issuecomment-711708398


   There are some bad case with this pr, for example @wangyum described in SPARK-33128：
   
   ```
   SELECT 1 UNION SELECT 1 UNION ALL SELECT 1
   ```
   
   this case can be passed in Hive 2.3 and Spark 2.4, but failed with this pr.


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