From 8e94d2721a9d3d36697e13f8cc6567ae8aeee78b Mon Sep 17 00:00:00 2001
From: Takuya UESHIN <ueshin@happy-camper.st>
Date: Sat, 10 May 2014 12:03:27 -0700
Subject: [PATCH] [SPARK-1778] [SQL] Add 'limit' transformation to SchemaRDD.
Add `limit` transformation to `SchemaRDD`.
Author: Takuya UESHIN <ueshin@happy-camper.st>
Closes #711 from ueshin/issues/SPARK-1778 and squashes the following commits:
33169df [Takuya UESHIN] Add 'limit' transformation to SchemaRDD.
---
.../src/main/scala/org/apache/spark/sql/SchemaRDD.scala | 9 +++++++++
.../test/scala/org/apache/spark/sql/DslQuerySuite.scala | 6 ++++++
2 files changed, 15 insertions(+)
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/SchemaRDD.scala b/sql/core/src/main/scala/org/apache/spark/sql/SchemaRDD.scala
index 34200be3ac..2569815ebb 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/SchemaRDD.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/SchemaRDD.scala
@@ -178,6 +178,15 @@ class SchemaRDD(
def orderBy(sortExprs: SortOrder*): SchemaRDD =
new SchemaRDD(sqlContext, Sort(sortExprs, logicalPlan))
+ /**
+ * Limits the results by the given expressions.
+ * {{{
+ * schemaRDD.limit(10)
+ * }}}
+ */
+ def limit(limitExpr: Expression): SchemaRDD =
+ new SchemaRDD(sqlContext, Limit(limitExpr, logicalPlan))
+
/**
* Performs a grouping followed by an aggregation.
*
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/DslQuerySuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/DslQuerySuite.scala
index be0f4a4c73..92a707ea57 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/DslQuerySuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/DslQuerySuite.scala
@@ -71,6 +71,12 @@ class DslQuerySuite extends QueryTest {
Seq((3,1), (3,2), (2,1), (2,2), (1,1), (1,2)))
}
+ test("limit") {
+ checkAnswer(
+ testData.limit(10),
+ testData.take(10).toSeq)
+ }
+
test("average") {
checkAnswer(
testData2.groupBy()(Average('a)),
--
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