Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19861#discussion_r155693977
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2ConfigSupport.scala
---
@@ -0,0 +1,85 @@
+/*
+ * 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 scala.collection.JavaConverters._
+import scala.collection.immutable
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.sources.v2.ConfigSupport
+
+private[sql] object DataSourceV2ConfigSupport extends Logging {
+
+ /**
+ * Helper method to propagate session configs with config key that
matches at least one of the
+ * given prefixes to the corresponding data source options.
+ *
+ * @param cs the session config propagate help class
+ * @param source the data source format
+ * @param conf the session conf
+ * @return an immutable map that contains all the session configs that
should be propagated to
+ * the data source.
+ */
+ def withSessionConfig(
+ cs: ConfigSupport,
+ source: String,
+ conf: SQLConf): immutable.Map[String, String] = {
+ val prefixes = cs.getConfigPrefixes
+ require(prefixes != null, "The config key-prefixes cann't be null.")
+ val mapping = cs.getConfigMapping.asScala
+ val validOptions = cs.getValidOptions
+ require(validOptions != null, "The valid options list cann't be null.")
--- End diff --
double n
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