[jira] [Created] (SPARK-29074) Optimize `date_format` for foldable `fmt`

Fri, 13 Sep 2019 02:42:43 -0700 

Maxim Gekk created SPARK-29074:
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             Summary: Optimize `date_format` for foldable `fmt`
                 Key: SPARK-29074
                 URL: https://issues.apache.org/jira/browse/SPARK-29074
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Maxim Gekk


The DateFormatClass 
([https://github.com/apache/spark/blob/67b4329fb08fd606461aa1ac9274c4a84d15d70e/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala#L583])
 could create the TimestampFormatter only once at the initialization, and reuse 
it in nullSafeEval() and in doGenCode().



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