Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/7238#discussion_r35087548
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/parquet/newParquet.scala ---
@@ -407,7 +410,17 @@ private[sql] class ParquetRelation2(
val filesToTouch =
if (shouldMergeSchemas) {
// Also includes summary files, 'cause there might be empty
partition directories.
- (metadataStatuses ++ commonMetadataStatuses ++
dataStatuses).toSeq
+
+ // If skipMergePartFiles config is true, we assume that all
part-files are the same for
+ // their schema with summary files, so we ignore them when
merging schema.
+ // If the config is false, which is the default setting, we
merge all part-files.
+ val needMerged: Seq[FileStatus] =
+ if (skipMergePartFiles) {
+ Seq()
+ } else {
+ dataStatuses
+ }
+ (metadataStatuses ++ commonMetadataStatuses ++ needMerged).toSeq
--- End diff --
Summary files are not always available. It's quite possible that
`metadataStatuses` and `commonMetadataStatuses` are both empty.
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