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https://issues.apache.org/jira/browse/SPARK-14321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15316451#comment-15316451
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Apache Spark commented on SPARK-14321:
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User 'rajeshbalamohan' has created a pull request for this issue:
https://github.com/apache/spark/pull/13522
> Reduce date format cost in date functions
> -----------------------------------------
>
> Key: SPARK-14321
> URL: https://issues.apache.org/jira/browse/SPARK-14321
> Project: Spark
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Priority: Minor
>
> Currently the code generated is
> {noformat}
> /* 066 */ UTF8String primitive5 = null;
> /* 067 */ if (!isNull4) {
> /* 068 */ try {
> /* 069 */ primitive5 = UTF8String.fromString(new
> java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(
> /* 070 */ new java.util.Date(primitive7 * 1000L)));
> /* 071 */ } catch (java.lang.Throwable e) {
> /* 072 */ isNull4 = true;
> /* 073 */ }
> /* 074 */ }
> {noformat}
> Instantiation of SimpleDateFormat is fairly expensive. It can be created on
> need basis.
> I will share the patch soon.
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