Github user ericl commented on the issue:
https://github.com/apache/spark/pull/14690
Making parquet reader case-insensitive is not too hard. The patch is pretty
small. Whether it's a good idea is another question, but it seems simpler than
any of the other workarounds.
```
private def clipParquetGroupFields(
parquetRecord: GroupType, structType: StructType): Seq[Type] = {
- val parquetFieldMap = parquetRecord.getFields.asScala.map(f =>
f.getName -> f).toMap
+ val parquetFieldMap = parquetRecord.getFields.asScala
+ .map(f => f.getName -> f).toMap
+ val caseInsensitiveParquetFieldMap = parquetRecord.getFields.asScala
+ .map(f => f.getName.toLowerCase -> f).toMap
val toParquet = new ParquetSchemaConverter(writeLegacyParquetFormat =
false)
structType.map { f =>
parquetFieldMap
.get(f.name)
+ .orElse(caseInsensitiveParquetFieldMap.get(f.name.toLowerCase))
```
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