Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20208#discussion_r201487246
--- Diff: docs/sql-programming-guide.md ---
@@ -815,6 +815,54 @@ should start with, they can set `basePath` in the data
source options. For examp
when `path/to/table/gender=male` is the path of the data and
users set `basePath` to `path/to/table/`, `gender` will be a partitioning
column.
+### Schema Evolution
--- End diff --
Thank you for review, @gatorsmile . I'll update like that.
For write operation, we cannot specify schema like read path, `.schema`.
Spark writes the new file into the directory additionally or overwrites the
directory.
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