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[SPARK-6296] [SQL] Added equals to Column #4988

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[SPARK-6296] [SQL] Added equals to Column #4988

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7 changes: 7 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 @@ -59,6 +59,13 @@ class Column(protected[sql] val expr: Expression) {

override def toString: String = expr.prettyString

override def equals(that: Any) = that match {
case that: Column => that.expr.equals(this.expr)
case _ => false
}

override def hashCode: Int = this.expr.hashCode

/**
* Unary minus, i.e. negate the expression.
* {{{
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5 changes: 5 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
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Expand Up @@ -313,4 +313,9 @@ class ColumnExpressionSuite extends QueryTest {
test("lift alias out of cast") {
assert(col("1234").as("name").cast("int").expr === col("1234").cast("int").as("name").expr)
}

test("columns can be compared") {
assert('key.desc == 'key.desc)
assert('key.desc != 'key.asc)
}
}