Github user OopsOutOfMemory commented on a diff in the pull request:
https://github.com/apache/spark/pull/3935#discussion_r22764434
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/sources/DDLTestSuit.scala ---
@@ -0,0 +1,74 @@
+/*
+* 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.sources
+import org.apache.spark.sql._
+
+
+class DDLScanSource extends RelationProvider {
+ override def createRelation(
+ sqlContext: SQLContext,
+ parameters: Map[String, String]): BaseRelation = {
+ SimpleDDLScan(parameters("from").toInt,
parameters("TO").toInt)(sqlContext)
+ }
+}
+
+case class SimpleDDLScan(from: Int, to: Int)(@transient val sqlContext:
SQLContext)
+ extends TableScan {
+
+ override def schema =
+ StructType(Seq(StructField("name", StringType, nullable = false),
+ StructField("age", IntegerType, nullable = false)))
+
+ override def buildScan() = sqlContext.sparkContext.parallelize(from to
to).
+ map(e => Row(s"people$e",e*2))
+}
+
+class DDLTestSuit extends DataSourceTest {
+ import caseInsensisitiveContext._
+
+ before {
+ sql(
+ """
+ |CREATE TEMPORARY TABLE ddlPeople
+ |USING org.apache.spark.sql.sources.DDLScanSource
+ |OPTIONS (
+ | From '1',
+ | To '10'
+ |)
+ """.stripMargin)
+ }
+
+ sqlTest(
+ "SELECT * FROM ddlPeople",
+ (1 to 10).map(e => Row(s"people$e",e*2)).toSeq)
+
+ sqlTest(
+ "describe ddlPeople",
+ Seq(
+ Row("name", "StringType", null),
--- End diff --
`simpleString ` fixed
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