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[SPARK-15647] [SQL] Fix Boundary Cases in OptimizeCodegen Rule #13392

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[SPARK-15647] [SQL] Fix Boundary Cases in OptimizeCodegen Rule #13392

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40b70f3
fix the boundary case.
gatorsmile May 29, 2016
aaf5f2e
remove the useless comments.
gatorsmile May 29, 2016
f351c10
style fix.
gatorsmile May 29, 2016
ecc4318
fix
gatorsmile May 30, 2016
db67f8c
revert
gatorsmile May 30, 2016
414e116
address comments
gatorsmile May 31, 2016
4306c4f
address comments
gatorsmile May 31, 2016
b2849e8
address comments
gatorsmile May 31, 2016
9830e31
address comments
gatorsmile May 31, 2016
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8 changes: 6 additions & 2 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -937,8 +937,12 @@ object SimplifyConditionals extends Rule[LogicalPlan] with PredicateHelper {
*/
case class OptimizeCodegen(conf: CatalystConf) extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transformAllExpressions {
case e @ CaseWhen(branches, _) if branches.size < conf.maxCaseBranchesForCodegen =>
e.toCodegen()
case e: CaseWhen if canCodegen(e) => e.toCodegen()
}

private def canCodegen(e: CaseWhen): Boolean = {
val numBranches = e.branches.size + e.elseValue.size
numBranches <= conf.maxCaseBranchesForCodegen
}
}

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29 changes: 29 additions & 0 deletions sql/core/src/test/scala/org/apache/spark/sql/internal/SQLConfSuite.scala
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Expand Up @@ -18,6 +18,7 @@
package org.apache.spark.sql.internal

import org.apache.spark.sql.{QueryTest, Row, SparkSession, SQLContext}
import org.apache.spark.sql.execution.WholeStageCodegenExec
import org.apache.spark.sql.test.{SharedSQLContext, TestSQLContext}

class SQLConfSuite extends QueryTest with SharedSQLContext {
Expand Down Expand Up @@ -219,4 +220,32 @@ class SQLConfSuite extends QueryTest with SharedSQLContext {
}
}

test("MAX_CASES_BRANCHES") {
withTable("tab1") {
spark.range(10).write.saveAsTable("tab1")
val sql_one_branch_caseWhen = "SELECT CASE WHEN id = 1 THEN 1 END FROM tab1"
val sql_two_branch_caseWhen = "SELECT CASE WHEN id = 1 THEN 1 ELSE 0 END FROM tab1"

withSQLConf(SQLConf.MAX_CASES_BRANCHES.key -> "0") {
assert(!sql(sql_one_branch_caseWhen)
.queryExecution.executedPlan.isInstanceOf[WholeStageCodegenExec])
assert(!sql(sql_two_branch_caseWhen)
.queryExecution.executedPlan.isInstanceOf[WholeStageCodegenExec])
}

withSQLConf(SQLConf.MAX_CASES_BRANCHES.key -> "1") {
assert(sql(sql_one_branch_caseWhen)
.queryExecution.executedPlan.isInstanceOf[WholeStageCodegenExec])
assert(!sql(sql_two_branch_caseWhen)
.queryExecution.executedPlan.isInstanceOf[WholeStageCodegenExec])
}

withSQLConf(SQLConf.MAX_CASES_BRANCHES.key -> "2") {
assert(sql(sql_one_branch_caseWhen)
.queryExecution.executedPlan.isInstanceOf[WholeStageCodegenExec])
assert(sql(sql_two_branch_caseWhen)
.queryExecution.executedPlan.isInstanceOf[WholeStageCodegenExec])
}
}
}
}