Github user chenliang613 commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1962#discussion_r170410120
--- Diff:
examples/spark2/src/main/scala/org/apache/carbondata/examples/DataFrameComplexTypeExample.scala
---
@@ -0,0 +1,88 @@
+/*
+ * 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.carbondata.examples
+
+import org.apache.spark.sql.SaveMode
+
+case class StructElement(school: Array[String], age: Int)
+case class ComplexTypeData(id: Int, name: String, city: String, salary:
Float, file: StructElement)
+
+// scalastyle:off println
+object DataFrameComplexTypeExample {
+
+ def main(args: Array[String]) {
+
+ val spark =
ExampleUtils.createCarbonSession("DataFrameComplexTypeExample", 4)
+ val complexTableName = s"complex_type_table"
+
+ import spark.implicits._
+
+ // drop table if exists previously
+ spark.sql(s"DROP TABLE IF EXISTS ${ complexTableName }")
+ spark.sql(
+ s"""
+ | CREATE TABLE ${ complexTableName }(
+ | id INT,
+ | name STRING,
+ | city STRING,
+ | salary FLOAT,
+ | file struct<school:array<string>, age:int>
+ | )
+ | STORED BY 'carbondata'
+ | TBLPROPERTIES(
+ | 'sort_columns'='name',
+ | 'dictionary_include'='city')
+ | """.stripMargin)
+
+ val sc = spark.sparkContext
+ // generate data
+ val df = sc.parallelize(Seq(
+ ComplexTypeData(1, "index_1", "city_1", 10000.0f,
+ StructElement(Array("struct_11", "struct_12"), 10)),
+ ComplexTypeData(2, "index_2", "city_2", 20000.0f,
+ StructElement(Array("struct_21", "struct_22"), 20)),
+ ComplexTypeData(3, "index_3", "city_3", 30000.0f,
+ StructElement(Array("struct_31", "struct_32"), 30))
+ )).toDF
+ df.printSchema()
+ df.write
+ .format("carbondata")
+ .option("tableName", complexTableName)
+ .option("single_pass", "true")
--- End diff --
why adds this option : option("single_pass", "true") ?
---
