Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18026#discussion_r117313888
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala ---
@@ -163,16 +163,10 @@ trait StreamSinkProvider {
@InterfaceStability.Stable
trait CreatableRelationProvider {
/**
- * Save the DataFrame to the destination and return a relation with the
given parameters based on
- * the contents of the given DataFrame. The mode specifies the expected
behavior of createRelation
- * when data already exists.
- * Right now, there are three modes, Append, Overwrite, and
ErrorIfExists.
- * Append mode means that when saving a DataFrame to a data source, if
data already exists,
- * contents of the DataFrame are expected to be appended to existing
data.
- * Overwrite mode means that when saving a DataFrame to a data source,
if data already exists,
- * existing data is expected to be overwritten by the contents of the
DataFrame.
- * ErrorIfExists mode means that when saving a DataFrame to a data
source,
- * if data already exists, an exception is expected to be thrown.
+ * Saves a DataFrame to a destination (using data source-specific
parameters)
+ *
+ * @param mode specifies what happens when the destination already exists
+ * @param parameters data source-specific parameters
--- End diff --
Also add `@return`?
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