Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19861#discussion_r156969856
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2Utils.scala
---
@@ -0,0 +1,54 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.execution.datasources.v2
+
+import java.util.regex.Pattern
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.internal.SQLConf
+
+private[sql] object DataSourceV2Utils extends Logging {
+
+ /**
+ * Helper method that turns session configs with config keys that start
with
+ * `spark.datasource.$keyPrefix` into k/v pairs, the k/v pairs will be
used to create data source
+ * options.
+ * A session config `spark.datasource.$keyPrefix.xxx -> yyy` will be
transformed into
+ * `xxx -> yyy`.
+ *
+ * @param keyPrefix the data source config key prefix to be matched
+ * @param conf the session conf
+ * @return an immutable map that contains all the extracted and
transformed k/v pairs.
+ */
+ def withSessionConfig(
--- End diff --
how about we do more things here?
```
def extractSessionConfigs(ds: DataSourceV2, conf: SQLConf) = ds match {
case cs: SessionConfigSupport => ...
case _ => Map.empty
}
```
and the caller side
```
val options = new DataSourceV2Options((extraOptions ++
extractSessionConfigs(ds, conf)).asJava)
```
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