Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/7070#issuecomment-116882483
Thanks for contributing this! This feature looks good, but still requires
some more polishing:
1. Please fix the style issues as I commented.
1. Please add this configuration to `SQLConf`. Example:
- [`SQLConf.PARQUET_FILTER_PUSHDOWN_ENABLED`] [1]
- [`SQLConf.parquetFilterPushDown`] [2]
1. Please add a test case for this.
For example, we can write two Parquet files with incompatible schemas
and put them into the same directory, then read the directory to see whether
the schema merging is triggered (if it's triggered, exception will be thrown
due to incompatible schemas).
[1]:
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala#L255-L261
[2]:
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/SQLConf.scala#L434
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