Github user lw-lin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16987#discussion_r103403986
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FileStreamSource.scala
---
@@ -159,28 +161,64 @@ 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.
+ * Only when user gives a non-glob path that will we figure out whether
the source has some
+ * metadata log
+ *
+ * None means we don't know at the moment
+ * Some(true) means we know for sure the source DOES have metadata
+ * Some(false) means we know for sure the source DOSE NOT have metadata
--- End diff --
( some notes here since the changes are not trival )
here we're using this `sourceHasMetadata` to indicate whether we know for
sure the source has metadata, as stated in the source file comments:
- `None` means we don't know at the moment
- `Some(true)` means we know for sure the source DOES have metadata
- `Some(false)` means we know for sure the source DOSE NOT have metadata
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