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[SPARK-27083][SQL]Add a new conf to control subqueryReuse #23998

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[SPARK-27083][SQL]Add a new conf to control subqueryReuse #23998

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8 changes: 8 additions & 0 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -880,6 +880,12 @@ object SQLConf {
.booleanConf
.createWithDefault(true)

val SUBQUERY_REUSE_ENABLED = buildConf("spark.sql.subquery.reuse")
.internal()
.doc("When true, the planner will try to find out duplicated subqueries and re-use them.")
.booleanConf
.createWithDefault(true)

val STATE_STORE_PROVIDER_CLASS =
buildConf("spark.sql.streaming.stateStore.providerClass")
.internal()
Expand Down Expand Up @@ -1866,6 +1872,8 @@ class SQLConf extends Serializable with Logging {

def exchangeReuseEnabled: Boolean = getConf(EXCHANGE_REUSE_ENABLED)

def subqueryReuseEnabled: Boolean = getConf(SUBQUERY_REUSE_ENABLED)

def caseSensitiveAnalysis: Boolean = getConf(SQLConf.CASE_SENSITIVE)

def constraintPropagationEnabled: Boolean = getConf(CONSTRAINT_PROPAGATION_ENABLED)
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2 changes: 1 addition & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/execution/subquery.scala
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Expand Up @@ -113,7 +113,7 @@ case class PlanSubqueries(sparkSession: SparkSession) extends Rule[SparkPlan] {
case class ReuseSubquery(conf: SQLConf) extends Rule[SparkPlan] {

def apply(plan: SparkPlan): SparkPlan = {
if (!conf.exchangeReuseEnabled) {
if (!conf.subqueryReuseEnabled) {
return plan
}
// Build a hash map using schema of subqueries to avoid O(N*N) sameResult calls.
Expand Down