Davies Liu created SPARK-8713:
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             Summary: Support codegen for not thread-safe expressions
                 Key: SPARK-8713
                 URL: https://issues.apache.org/jira/browse/SPARK-8713
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Davies Liu
            Assignee: Davies Liu


Currently, we disable codegen if any expression is not thread safe. We should 
support that, but disable caching the compiled expresssions.



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