Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/3558#discussion_r27184655
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/CatalystConf.scala ---
@@ -0,0 +1,53 @@
+/*
+ * 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
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+ * 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 scala.collection.immutable
+
+private[spark] object CatalystConf{
+ val CASE_SENSITIVE = "spark.sql.caseSensitive"
+}
+
+private[spark] trait CatalystConf {
--- End diff --
I think the catalyst conf can be as simple as a set of abstract methods
that need to be implemented by some concrete conf.
```scala
trait CatalystConf {
def caseSensitiveAnalysis: Boolean
}
```
We can have a trivial one for testing: `case class
SimpleConf(caseSensitiveAnalysis: Boolean) extends CatalystConf` and SQLConf
can mix this trait in.
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