Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/11573#discussion_r55324768
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
@@ -0,0 +1,197 @@
+/*
+ * 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
+
+import org.apache.spark.Logging
+import org.apache.spark.sql.{Row, SQLContext}
+import org.apache.spark.sql.catalyst.TableIdentifier
+import org.apache.spark.sql.catalyst.expressions.{Attribute,
AttributeReference}
+import org.apache.spark.sql.execution.datasources.BucketSpec
+import org.apache.spark.sql.types._
+
+
+/**
+ * A DDL command expected to be run in the underlying system without Spark
parsing the
+ * query text.
+ */
+abstract class NativeDDLCommands(val sql: String) extends RunnableCommand {
+
+ override def run(sqlContext: SQLContext): Seq[Row] = {
+ sqlContext.runNativeSql(sql)
+ }
+
+ override val output: Seq[Attribute] = {
+ Seq(AttributeReference("result", StringType, nullable = false)())
+ }
+
+}
+
+case class CreateDatabase(
+ databaseName: String,
+ allowExisting: Boolean,
+ path: Option[String],
+ comment: Option[String],
+ props: Map[String, String])(sql: String)
+ extends NativeDDLCommands(sql) with Logging
+
+case class CreateFunction(
+ functionName: String,
+ alias: String,
+ resourcesMap: Map[String, String],
+ isTemp: Boolean)(sql: String)
+ extends NativeDDLCommands(sql) with Logging
+
+case class AlterTableRename(
+ tableName: TableIdentifier,
+ renameTableName: TableIdentifier)(sql: String)
+ extends NativeDDLCommands(sql) with Logging
+
+case class AlterTableSetProperties(
+ tableName: TableIdentifier,
+ setProperties: Map[String, Option[String]])(sql: String)
+ extends NativeDDLCommands(sql) with Logging
+
+case class AlterTableDropProperties(
+ tableName: TableIdentifier,
+ dropProperties: Map[String, Option[String]],
+ allowExisting: Boolean)(sql: String)
+ extends NativeDDLCommands(sql) with Logging
+
+case class AlterTableSerDeProperties(
+ tableName: TableIdentifier,
+ serdeClassName: Option[String],
+ serdeProperties: Option[Map[String, Option[String]]],
+ partition: Option[Map[String, Option[String]]])(sql: String)
+ extends NativeDDLCommands(sql) with Logging
+
+case class AlterTableStoreProperties(
+ tableName: TableIdentifier,
+ buckets: Option[BucketSpec],
+ // TODO: use `clustered` and `sorted` instead for simplicity
+ noClustered: Boolean,
+ noSorted: Boolean)(sql: String)
+ extends NativeDDLCommands(sql) with Logging
+
+case class AlterTableSkewed(
+ tableName: TableIdentifier,
+ skewedCols: Seq[String],
+ skewedValues: Seq[Seq[String]],
+ storedAsDirs: Boolean,
+ notSkewed: Boolean,
+ // TODO: what??
+ notStoredAsDirs: Boolean)(sql: String)
--- End diff --
`notStoredAsDirs` is used when the command is `ALTER TABLE table_name NOT
STORED AS DIRECTORIES`. When it is true, `storedAsDirs` is false of course.
`storedAsDirs` is used with skewed arguments columns and values.
I think we can use just one variable for them.
When the command is `ALTER TABLE table_name NOT SKEWED`, then the values of
`notStoredAsDirs` and `storedAsDirs` don't matter.
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