Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/9940#discussion_r50165611
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilters.scala
---
@@ -207,11 +207,19 @@ private[sql] object ParquetFilters {
*/
}
+ private def getFieldMap(dataType: DataType): Array[(String, DataType)] =
dataType match {
--- End diff --
It's not quite intuitive why this method is needed. Can we add a comment
here to explain why fields with "optional" metadata should be filtered?
Corresponding JIRA links should also be mentioned.
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