Github user jackylk commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1490#discussion_r150506530
--- Diff:
integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/datamap/CarbonDataMapShowCommand.scala
---
@@ -0,0 +1,67 @@
+/*
+ * 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.execution.command.datamap
+
+import scala.collection.JavaConverters._
+
+import org.apache.spark.sql.{CarbonEnv, Row, SparkSession}
+import org.apache.spark.sql.catalyst.expressions.{Attribute,
AttributeReference}
+import org.apache.spark.sql.execution.command.{Checker,
DataProcessCommand, RunnableCommand}
+import org.apache.spark.sql.hive.CarbonRelation
+import org.apache.spark.sql.types.StringType
+
+/**
+ * Show the datamaps on the table
+ * @param databaseNameOp
+ * @param tableName
+ */
+case class CarbonDataMapShowCommand(
+ databaseNameOp: Option[String],
+ tableName: String)
+ extends RunnableCommand with DataProcessCommand {
+
+ override def output: Seq[Attribute] = {
+ Seq(AttributeReference("DataMapName", StringType, nullable = false)(),
+ AttributeReference("ClassName", StringType, nullable = false)(),
+ AttributeReference("Associated Table", StringType, nullable =
false)())
+ }
+
+ override def run(sparkSession: SparkSession): Seq[Row] = {
+ processData(sparkSession)
+ }
+
+ override def processData(sparkSession: SparkSession): Seq[Row] = {
+ Checker.validateTableExists(databaseNameOp, tableName, sparkSession)
+ val carbonTable = CarbonEnv.getInstance(sparkSession).carbonMetastore.
+ lookupRelation(databaseNameOp,
tableName)(sparkSession).asInstanceOf[CarbonRelation].
+ tableMeta.carbonTable
+ val schemaList = carbonTable.getTableInfo.getDataMapSchemaList
+ if (schemaList != null && schemaList.size() > 0) {
+ schemaList.asScala.map { s =>
+ var table = "-NA-"
--- End diff --
I think `(NA)` is better
---
