Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20208#discussion_r201170482
--- 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 --
I still want to avoid using `schema evolution` in the doc or tests. `Schema
Projection` might better. More importantly, you have to clarify that this only
covers the read path.
What is the behavior in the write path when the physical and data schemas
are different.
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