Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14660#discussion_r74889938
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFileFormat.scala
---
@@ -224,7 +226,16 @@ class ParquetFileFormat
.orElse(filesByType.data.headOption)
.toSeq
}
- ParquetFileFormat.mergeSchemasInParallel(filesToTouch, sparkSession)
+
+ filesToTouch match {
+ case f :: Nil =>
--- End diff --
if you are doing this, we should probably add an undocumented config option
to control this. I also think the number can be bigger. We'd need to experiment
with it though.
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