Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4015#discussion_r28744983
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/Dialect.scala ---
@@ -0,0 +1,32 @@
+/*
+ * 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.catalyst
+
+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
+
+// Root class of SQL Parser Dialect, and we don't guarantee the binary
+// compatibility for the future release, let's keep it as the internal
+// interface for advanced user for now.
+abstract class Dialect {
+ // Will be called once after the instance created.
+ // this can be overwritten by subclasses for doing its own initialization
+ def initialize(config: CatalystConfig): Dialect = this
--- End diff --
We should just get rid of this if we don't need it. As it stands it is
completely worthless (`CatalystConf` does not have any methods).
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