Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10972#discussion_r51218082
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetRelation.scala
---
@@ -799,9 +799,31 @@ private[sql] object ParquetRelation extends Logging {
assumeInt96IsTimestamp = assumeInt96IsTimestamp,
writeLegacyParquetFormat = writeLegacyParquetFormat)
- footers.map { footer =>
- ParquetRelation.readSchemaFromFooter(footer, converter)
- }.reduceLeftOption(_ merge _).iterator
+ if (footers.isEmpty) {
+ Iterator.empty
+ } else {
+ val pathsAndSchemata = footers.map { footer =>
+ footer.getFile ->
ParquetRelation.readSchemaFromFooter(footer, converter)
+ }
+
+ pathsAndSchemata.foldLeft(StructType(Nil)) { case
(mergedSoFar, (file, schema)) =>
+ try {
+ mergedSoFar.merge(schema)
+ } catch {
+ case cause: Throwable =>
+ throw new SparkException(
+ s"""Failed merging schema of file $file:
--- End diff --
Failed to merge
---
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