Github user sounakr commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1469#discussion_r153076321
--- Diff:
integration/spark2/src/main/scala/org/apache/spark/sql/CarbonExpressions.scala
---
@@ -0,0 +1,110 @@
+/*
+ * 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
+
+import org.apache.spark.sql.catalyst.TableIdentifier
+import org.apache.spark.sql.catalyst.analysis.UnresolvedRelation
+import
org.apache.spark.sql.catalyst.catalog.CatalogTypes.TablePartitionSpec
+import org.apache.spark.sql.catalyst.expressions.{Attribute, Cast,
Expression}
+import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan,
SubqueryAlias}
+import org.apache.spark.sql.execution.command.DescribeTableCommand
+import org.apache.spark.sql.types.DataType
+
+/**
+ * This class contains the wrappers of all the case classes which are
common
+ * across spark version 2.1 and 2.2 but have change in parameter list.
+ * Below are the overriden unapply methods in order to make it work
+ * across both the version of spark2.1 and spark 2.2
+ */
+object CarbonExpressions {
+
+ /**
+ * unapply method of Cast class.
+ */
+ object MatchCast {
+ def unapply(expr: Expression): Option[(Attribute, DataType)] = {
+ if (expr.isInstanceOf[Cast] &&
expr.asInstanceOf[Cast].child.isInstanceOf[Attribute]) {
+ Some((expr.asInstanceOf[Cast].child.asInstanceOf[Attribute],
expr.asInstanceOf[Cast].child
+ .dataType))
+ } else {
+ None
+ }
+ }
+ }
+
+ /**
+ * unapply method of Describe Table format.
+ */
+ object CarbonDescribeTable {
+ def unapply(plan: LogicalPlan): Option[(TableIdentifier,
TablePartitionSpec, Boolean)] = {
+ if (plan.isInstanceOf[DescribeTableCommand]) {
--- End diff --
Done
---
