Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/8228#discussion_r37147548
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/CatalystRowConverter.scala
---
@@ -126,7 +169,24 @@ private[parquet] class CatalystRowConverter(
// Converters for each field.
private val fieldConverters: Array[Converter with
HasParentContainerUpdater] = {
- parquetType.getFields.zip(catalystType).zipWithIndex.map {
+ // In case of schema merging, `parquetType` can be a subset of
`catalystType`. We need to pad
+ // those missing fields and create converters for them, although
values of these fields are
+ // always null.
+ val paddedParquetFields = {
+ val parquetFields = parquetType.getFields
+ val parquetFieldNames = parquetFields.map(_.getName).toSet
+ val missingFields = catalystType.filterNot(f =>
parquetFieldNames.contains(f.name))
--- End diff --
Will the case-sensitivity of field names introduce any issue at here?
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