Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/16987#discussion_r103363591
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FileStreamSource.scala
---
@@ -158,12 +158,28 @@ class FileStreamSource(
}
/**
+ * If the source has a metadata log indicating which files should be
read, then we should use it.
+ * We figure out whether there exists some metadata log only when user
gives a non-glob path.
+ */
+ private val sourceHasMetadata: Boolean =
--- End diff --
Actually, why not just change `sourceHasMetadata` to a method?
`sparkSession.sessionState.newHadoopConf()` seems expensive but we can save it
into a field.
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