Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/13013#discussion_r62740925
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -444,8 +447,10 @@ final class DataFrameWriter private[sql](df:
DataFrame) {
* save mode, specified by the `mode` function (default to throwing an
exception).
* When `mode` is `Overwrite`, the schema of the [[DataFrame]] does not
need to be
* the same as that of the existing table.
- * When `mode` is `Append`, the schema of the [[DataFrame]] need to be
- * the same as that of the existing table, and format or options will be
ignored.
+ *
+ * When `mode` is `Append`, the format or options will be ignored. The
column order in the schema
+ * of the [[DataFrame]] doesn't need to be same as that of the existing
table. Unlike
+ * `insertInto`, `saveAsTable` will use the column names to find the
correct column positions.
--- End diff --
How about we also add an example at here?
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