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[SPARK-8026][SQL] Add Column.alias to Scala/Java DataFrame API #6565

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[SPARK-8026][SQL] Add Column.alias to Scala/Java DataFrame API #6565

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12 changes: 12 additions & 0 deletions sql/core/src/main/scala/org/apache/spark/sql/Column.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -716,6 +716,18 @@ class Column(protected[sql] val expr: Expression) extends Logging {
*/
def endsWith(literal: String): Column = this.endsWith(lit(literal))

/**
* Gives the column an alias. Same as `as`.
* {{{
* // Renames colA to colB in select output.
* df.select($"colA".alias("colB"))
* }}}
*
* @group expr_ops
* @since 1.4.0
*/
def alias(alias: String): Column = as(alias)

/**
* Gives the column an alias.
* {{{
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6 changes: 6 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
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Expand Up @@ -27,6 +27,12 @@ import org.apache.spark.sql.types._
class ColumnExpressionSuite extends QueryTest {
import org.apache.spark.sql.TestData._

test("alias") {
val df = Seq((1, Seq(1, 2, 3))).toDF("a", "intList")
assert(df.select(df("a").as("b")).columns.head === "b")
assert(df.select(df("a").alias("b")).columns.head === "b")
}

test("single explode") {
val df = Seq((1, Seq(1, 2, 3))).toDF("a", "intList")
checkAnswer(
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