Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/19861#discussion_r156883149 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/Utils.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 Utils 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( + keyPrefix: String, + conf: SQLConf): Map[String, String] = { + require(keyPrefix != null, "The data source config key prefix can't be null.") + + val pattern = Pattern.compile(s"^spark\\.datasource\\.$keyPrefix\\.(.*)") --- End diff -- can we move it out and make it a memory variable?
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