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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.sql.catalyst.optimizer
import org.apache.spark.sql.catalyst.dsl.plans._
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.expressions.Literal.{FalseLiteral, TrueLiteral}
import org.apache.spark.sql.catalyst.plans.PlanTest
import org.apache.spark.sql.catalyst.plans.logical._
import org.apache.spark.sql.catalyst.rules._
import org.apache.spark.sql.types.{IntegerType, NullType}
class SimplifyConditionalSuite extends PlanTest with PredicateHelper {
object Optimize extends RuleExecutor[LogicalPlan] {
val batches = Batch("SimplifyConditionals", FixedPoint(50), SimplifyConditionals) :: Nil
}
protected def assertEquivalent(e1: Expression, e2: Expression): Unit = {
val correctAnswer = Project(Alias(e2, "out")() :: Nil, OneRowRelation).analyze
val actual = Optimize.execute(Project(Alias(e1, "out")() :: Nil, OneRowRelation).analyze)
comparePlans(actual, correctAnswer)
}
private val trueBranch = (TrueLiteral, Literal(5))
private val normalBranch = (NonFoldableLiteral(true), Literal(10))
private val unreachableBranch = (FalseLiteral, Literal(20))
private val nullBranch = (Literal.create(null, NullType), Literal(30))
test("simplify if") {
assertEquivalent(
If(TrueLiteral, Literal(10), Literal(20)),
Literal(10))
assertEquivalent(
If(FalseLiteral, Literal(10), Literal(20)),
Literal(20))
assertEquivalent(
If(Literal.create(null, NullType), Literal(10), Literal(20)),
Literal(20))
}
test("remove unreachable branches") {
// i.e. removing branches whose conditions are always false
assertEquivalent(
CaseWhen(unreachableBranch :: normalBranch :: unreachableBranch :: nullBranch :: Nil, None),
CaseWhen(normalBranch :: Nil, None))
}
test("remove entire CaseWhen if only the else branch is reachable") {
assertEquivalent(
CaseWhen(unreachableBranch :: unreachableBranch :: nullBranch :: Nil, Some(Literal(30))),
Literal(30))
assertEquivalent(
CaseWhen(unreachableBranch :: unreachableBranch :: Nil, None),
Literal.create(null, IntegerType))
}
test("remove entire CaseWhen if the first branch is always true") {
assertEquivalent(
CaseWhen(trueBranch :: normalBranch :: nullBranch :: Nil, None),
Literal(5))
// Test branch elimination and simplification in combination
assertEquivalent(
CaseWhen(unreachableBranch :: unreachableBranch :: nullBranch :: trueBranch :: normalBranch
:: Nil, None),
Literal(5))
// Make sure this doesn't trigger if there is a non-foldable branch before the true branch
assertEquivalent(
CaseWhen(normalBranch :: trueBranch :: normalBranch :: Nil, None),
CaseWhen(normalBranch :: trueBranch :: normalBranch :: Nil, None))
}
}
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