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https://issues.apache.org/jira/browse/SPARK-20773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012992#comment-16012992
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Apache Spark commented on SPARK-20773:
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User 'tpoterba' has created a pull request for this issue:
https://github.com/apache/spark/pull/18005
> ParquetWriteSupport.writeFields is quadratic in number of fields
> ----------------------------------------------------------------
>
> Key: SPARK-20773
> URL: https://issues.apache.org/jira/browse/SPARK-20773
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.1
> Reporter: T Poterba
> Priority: Minor
> Labels: easyfix, performance
> Original Estimate: 10m
> Remaining Estimate: 10m
>
> The writeFields method in ParquetWriteSupport uses Seq.apply(i) to select all
> elements. Since the fieldWriters object is a List, this is a quadratic
> operation.
> See line 123:
> https://github.com/apache/spark/blob/ac1ab6b9db188ac54c745558d57dd0a031d0b162/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetWriteSupport.scala
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