Github user ravipesala commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1469#discussion_r152579581
--- Diff: integration/spark2/src/main/scala/org/apache/spark/sql/CarbonExpressions.scala ---
@@ -0,0 +1,107 @@
+/*
+ * 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
+
+
+object CarbonExpressions {
+
+ object MatchCast {
+ def unapply(expr: Expression): Option[(Attribute, DataType)] = {
+ if (expr.isInstanceOf[Cast]) {
+ val castExpr = expr.asInstanceOf[Cast]
+ if (castExpr.child.isInstanceOf[Attribute]) {
+ Some((castExpr.child.asInstanceOf[Attribute], castExpr.dataType))
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+
+ }
+ }
+
+ object CarbonDescribeTable {
+ def unapply(plan: LogicalPlan): Option[(TableIdentifier, TablePartitionSpec, Boolean)] = {
+ if (plan.isInstanceOf[DescribeTableCommand]) {
+ val describeTableCommand = plan.asInstanceOf[DescribeTableCommand]
+ if (describeTableCommand.table.isInstanceOf[TableIdentifier]) {
+ if (describeTableCommand.partitionSpec.isInstanceOf[TablePartitionSpec]) {
+ if (describeTableCommand.isExtended.isInstanceOf[Boolean]) {
+ Some(describeTableCommand.table,
+ describeTableCommand.partitionSpec,
+ describeTableCommand.isExtended)
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ } else {
+ None
+ }
+ }
+ }
+
+ object CarbonSubqueryAlias {
+ def unapply(plan: LogicalPlan): Option[(String, LogicalPlan)] = {
+ if (plan.isInstanceOf[SubqueryAlias]) {
+ val subqueryAlias = plan.asInstanceOf[SubqueryAlias]
+ if (subqueryAlias.alias.isInstanceOf[String]) {
+ if (subqueryAlias.child.isInstanceOf[LogicalPlan]) {
+ Some(subqueryAlias.alias,
+ subqueryAlias.child)
--- End diff --
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