Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21320#discussion_r199364935
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetReadSupport.scala
---
@@ -71,9 +80,22 @@ private[parquet] class ParquetReadSupport(val convertTz:
Option[TimeZone])
StructType.fromString(schemaString)
}
- val parquetRequestedSchema =
+ val clippedParquetSchema =
ParquetReadSupport.clipParquetSchema(context.getFileSchema,
catalystRequestedSchema)
+ val parquetRequestedSchema = if (parquetMrCompatibility) {
--- End diff --
This is only for nested schema pruning? Turn this off when
`spark.sql.nestedSchemaPruning.enabled` is off?
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