HyukjinKwon commented on a change in pull request #24307: [SPARK-25407][SQL]
Ensure we pass a compatible pruned schema to ParquetRowConverter
URL: https://github.com/apache/spark/pull/24307#discussion_r272870708
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetReadSupport.scala
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@@ -322,6 +341,32 @@ private[parquet] object ParquetReadSupport {
}
}
+ /**
+ * Computes the structural intersection between two Parquet group types.
Review comment:
It would be great that we mention this is because parquet library does not
support the nested field access to non-existent field while parquet library
does support to read the non-existent field by regular field access.
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