Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/9405#discussion_r44616082
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetRelation.scala
---
@@ -208,7 +208,15 @@ private[sql] class ParquetRelation(
// Parquet data source always uses Catalyst internal representations.
override val needConversion: Boolean = false
- override def sizeInBytes: Long =
metadataCache.dataStatuses.map(_.getLen).sum
+ override def sizeInBytes: Long =
+ if (shouldMergeSchemas && mergeRespectSummaries) {
+ // If we are going to merge schema and this relation is configured to
+ // respect summaries (i.e., skip part-files), we will assume that
the size of
+ // this relation is large and can't be broadcasted.
--- End diff --
Yeah, I understand that this is a "safe" assumption. However, we don't need
to do this assumption if `FileStatus`es of part-files are properly cached.
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