Github user j-baker commented on a diff in the pull request:
https://github.com/apache/spark/pull/19136#discussion_r138289995
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/DataSourceV2Options.java
---
@@ -0,0 +1,57 @@
+/*
+ * 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.sources.v2;
+
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
+/**
+ * An immutable case-insensitive string-to-string map, which is used to
represent data source
+ * options.
+ */
+public class DataSourceV2Options {
+ private Map<String, String> keyLowerCasedMap;
+
+ private String toLowerCase(String key) {
+ return key.toLowerCase(Locale.ROOT);
+ }
+
+ public DataSourceV2Options(Map<String, String> originalMap) {
+ keyLowerCasedMap = new HashMap<>(originalMap.size());
+ for (Map.Entry<String, String> entry : originalMap.entrySet()) {
+ keyLowerCasedMap.put(toLowerCase(entry.getKey()), entry.getValue());
+ }
+ }
+
+ /**
+ * Returns the option value to which the specified key is mapped,
case-insensitively,
+ * or {@code null} if there is no mapping for the key.
+ */
+ public String get(String key) {
+ return keyLowerCasedMap.get(toLowerCase(key));
+ }
+
+ /**
+ * Returns the option value to which the specified key is mapped,
case-insensitively,
+ * or {@code defaultValue} if there is no mapping for the key.
+ */
+ public String getOrDefault(String key, String defaultValue) {
--- End diff --
if the above returns `Optional`, you probably don't need this method.
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