add test

Author: Davies Liu

sql/core/src/test/scala/org/apache/spark/sql/parquet/ParquetQuerySuite.scala

@@ -19,6 +19,7 @@ package org.apache.spark.sql.parquet
 
 import org.scalatest.BeforeAndAfterAll
 
+import org.apache.spark.sql.types._
 import org.apache.spark.sql.{SQLConf, QueryTest}
 import org.apache.spark.sql.catalyst.expressions.Row
 import org.apache.spark.sql.test.TestSQLContext
@@ -111,6 +112,18 @@ class ParquetQuerySuiteBase extends QueryTest with ParquetTest {
         List(Row("same", "run_5", 100)))
     }
   }
+
+  test("SPARK-6917 DecimalType should work with non-native types") {
+    val data = (1 to 10).map(i => Row(Decimal(i, 18, 0), new java.sql.Timestamp(i)))
+    val schema = StructType(List(StructField("d", DecimalType(18, 0), false),
+      StructField("time", TimestampType, false)).toArray)
+    withTempPath { file =>
+      val df = sqlContext.createDataFrame(sparkContext.parallelize(data), schema)
+      df.write.parquet(file.getCanonicalPath)
+      val df2 = sqlContext.read.parquet(file.getCanonicalPath)
+      checkAnswer(df2, df.collect().toSeq)
+    }
+  }
 }
 
 class ParquetDataSourceOnQuerySuite extends ParquetQuerySuiteBase with BeforeAndAfterAll {