[jira] [Created] (SPARK-5346) Parquet filter pushdown is not enabled when parquet.task.side.metadata is set to true (default value)

["Cheng Lian (JIRA)" <ji...@apache.org>]

Cheng Lian created SPARK-5346:
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             Summary: Parquet filter pushdown is not enabled when parquet.task.side.metadata is set to true (default value)
                 Key: SPARK-5346
                 URL: https://issues.apache.org/jira/browse/SPARK-5346
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.2.0, 1.3.0
            Reporter: Cheng Lian
            Priority: Critical


When computing Parquet splits, reading Parquet metadata from executor side is more memory efficient, thus Spark SQL [sets {{parquet.task.side.metadata}} to {{true}} by default|https://github.com/apache/spark/blob/v1.2.0/sql/core/src/main/scala/org/apache/spark/sql/parquet/ParquetTableOperations.scala#L437]. However, somehow this disables filter pushdown. Now Parquet filter pushdown is only enabled when {{spark.sql.parquet.filterPushdown}} set to {{true}} while {{parquet.task.side.metadata}} set to {{false}}. For large Parquet files with thousands of part-files and/or thousands of columns, reading metadata from driver side eats lots of memory.



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