[jira] [Resolved] (SPARK-3196) Expression Evaluation Performance Improvement

["Michael Armbrust (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-3196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Armbrust resolved SPARK-3196.
-------------------------------------
    Resolution: Fixed

Both subtasks are complete

> Expression Evaluation Performance Improvement
> ---------------------------------------------
>
>                 Key: SPARK-3196
>                 URL: https://issues.apache.org/jira/browse/SPARK-3196
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Cheng Hao
>
> The expression id generations depend on a atomic long object internally, which will cause the performance drop dramatically in a multi-threading execution.
> I'd like to create 2 sub tasks(maybe more) for the improvements:
> 1) Reduce the expression tree object creation from the aggregation functions (min/max), as they will create expression trees for each single row.
> 2) Remove the id property from the TreeNode API.
> And remove the expression object creation as many as possible, where we have the expression evaluation. (I will create couple of subtask soon).



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