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[SPARK-18063][SQL] Failed to infer constraints over multiple aliases #15597

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[SPARK-18063][SQL] Failed to infer constraints over multiple aliases #15597

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0700d84
fix replace alias on constraints rule.
jiangxb1987 Oct 21, 2016
2fe728f
modify test cases.
jiangxb1987 Oct 22, 2016
32e0b36
bugfix
jiangxb1987 Oct 24, 2016
3f07493
improve generate of constraints set.
jiangxb1987 Oct 25, 2016
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16 changes: 10 additions & 6 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -293,15 +293,19 @@ abstract class UnaryNode extends LogicalPlan {
* expressions with the corresponding alias
*/
protected def getAliasedConstraints(projectList: Seq[NamedExpression]): Set[Expression] = {
projectList.flatMap {
var allConstraints = child.constraints.asInstanceOf[Set[Expression]]
projectList.foreach {
case a @ Alias(e, _) =>
child.constraints.map(_ transform {
// For every alias in `projectList`, replace the reference in constraints by its attribute.
allConstraints ++= allConstraints.map(_ transform {
case expr: Expression if expr.semanticEquals(e) =>
a.toAttribute
}).union(Set(EqualNullSafe(e, a.toAttribute)))
case _ =>
Set.empty[Expression]
}.toSet
})
allConstraints += EqualNullSafe(e, a.toAttribute)
case _ => // Don't change.
}

allConstraints -- child.constraints
}

override protected def validConstraints: Set[Expression] = child.constraints
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8 changes: 8 additions & 0 deletions ...alyst/src/test/scala/org/apache/spark/sql/catalyst/plans/ConstraintPropagationSuite.scala
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Expand Up @@ -128,8 +128,16 @@ class ConstraintPropagationSuite extends SparkFunSuite {
ExpressionSet(Seq(resolveColumn(aliasedRelation.analyze, "x") > 10,
IsNotNull(resolveColumn(aliasedRelation.analyze, "x")),
resolveColumn(aliasedRelation.analyze, "b") <=> resolveColumn(aliasedRelation.analyze, "y"),
resolveColumn(aliasedRelation.analyze, "z") <=> resolveColumn(aliasedRelation.analyze, "x"),
resolveColumn(aliasedRelation.analyze, "z") > 10,
IsNotNull(resolveColumn(aliasedRelation.analyze, "z")))))

val multiAlias = tr.where('a === 'c + 10).select('a.as('x), 'c.as('y))
verifyConstraints(multiAlias.analyze.constraints,
ExpressionSet(Seq(IsNotNull(resolveColumn(multiAlias.analyze, "x")),
IsNotNull(resolveColumn(multiAlias.analyze, "y")),
resolveColumn(multiAlias.analyze, "x") === resolveColumn(multiAlias.analyze, "y") + 10))
)
}

test("propagating constraints in union") {
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