maropu commented on pull request #30332:
URL: https://github.com/apache/spark/pull/30332#issuecomment-725737152


   In SQL statements, a semicolon has a special meaning, so the proposed idea 
sounds reasonable to me. But, in branch-3.0/2.4, we already have accepted it 
like the example below (the failed test above);
   ```
   // v3.0.1 and v2.6.7
   scala> sql("SET spark.ui.xXssProtection=1; mode=block").show()
   +--------------------+-------------+
   |                 key|        value|
   +--------------------+-------------+
   |spark.ui.xXssProt...|1; mode=block|
   +--------------------+-------------+
   ```
   Probably, the case above should be "SET spark.ui.xXssProtection=\`1; 
mode=block\`" as you suggested. So, how about adding a legacy config and 
updating the migration?


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