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https://issues.apache.org/jira/browse/SPARK-34937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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cp resolved SPARK-34937.
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Resolution: Not A Problem
> Remove unnecessary sort in FileFormatWriter when only have one partition
> ------------------------------------------------------------------------
>
> Key: SPARK-34937
> URL: https://issues.apache.org/jira/browse/SPARK-34937
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.1
> Reporter: cp
> Priority: Minor
>
> sort is a very resource-intensive operation, spark may add SortExec when
> writing partition file for writing sequentially, but i think sorting is
> unnecessary when only have one partition.
>
> related file:
> {code:java}
> org.apache.spark.sql.execution.datasources.FileFormatWriter
> {code}
> related code:
> {code:java}
> // We should first sort by partition columns, then bucket id, and finally
> sorting columns.
> val requiredOrdering = partitionColumns ++ bucketIdExpression ++ sortColumns
> // the sort order doesn't matter
> val actualOrdering = plan.outputOrdering.map(_.child)
> val orderingMatched = if (requiredOrdering.length > actualOrdering.length) {
> false
> } else {
> requiredOrdering.zip(actualOrdering).forall {
> case (requiredOrder, childOutputOrder) =>
> requiredOrder.semanticEquals(childOutputOrder)
> }
> }{code}
>
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