T Poterba created SPARK-20773:
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Summary: ParquetWriteSupport.writeFields has 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
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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