ulysses-you commented on a change in pull request #25464: [SPARK-28746][SQL]
Add partitionby hint for sql queries
URL: https://github.com/apache/spark/pull/25464#discussion_r338847370
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveHints.scala
##########
@@ -137,31 +137,96 @@ object ResolveHints {
}
/**
- * COALESCE Hint accepts name "COALESCE" and "REPARTITION".
- * Its parameter includes a partition number.
+ * COALESCE Hint accepts names "COALESCE", "REPARTITION", and
"REPARTITIONBYRANGE".
*/
- object ResolveCoalesceHints extends Rule[LogicalPlan] {
- private val COALESCE_HINT_NAMES = Set("COALESCE", "REPARTITION")
+ class ResolveCoalesceHints(conf: SQLConf) extends Rule[LogicalPlan] {
+
+ /**
+ * This function handles hints for "COALESCE" and "REPARTITION".
+ * The "COALESCE" hint only has a partition number as a parameter. The
"REPARTITION" hint
+ * has a partition number, columns, or both of them as parameters.
+ */
+ private def createRepartition(
+ shuffle: Boolean, hint: UnresolvedHint): LogicalPlan = {
+ val hintName = hint.name.toUpperCase(Locale.ROOT)
+
+ def createRepartitionByExpression(
+ numPartitions: Int, partitionExprs: Seq[Any]):
RepartitionByExpression = {
+ val invalidParams =
partitionExprs.filter(!_.isInstanceOf[UnresolvedAttribute])
+ if (invalidParams.nonEmpty) {
+ throw new AnalysisException(s"$hintName Hint parameter should
include columns, but " +
+ s"${invalidParams.mkString(", ")} found")
+ }
+ RepartitionByExpression(
+ partitionExprs.map(_.asInstanceOf[Expression]), hint.child,
numPartitions)
+ }
- def apply(plan: LogicalPlan): LogicalPlan = plan.resolveOperators {
- case h: UnresolvedHint if
COALESCE_HINT_NAMES.contains(h.name.toUpperCase(Locale.ROOT)) =>
- val hintName = h.name.toUpperCase(Locale.ROOT)
- val shuffle = hintName match {
- case "REPARTITION" => true
- case "COALESCE" => false
+ hint.parameters match {
+ case Seq(IntegerLiteral(numPartitions)) =>
+ Repartition(numPartitions, shuffle, hint.child)
+ case Seq(numPartitions: Int) =>
+ Repartition(numPartitions, shuffle, hint.child)
+ // The "COALESCE" hint (shuffle = false) must have a partition number
only
+ case _ if !shuffle =>
+ throw new AnalysisException(s"$hintName Hint expects a partition
number as a parameter")
+
+ case param @ Seq(IntegerLiteral(numPartitions), _*) if shuffle =>
+ createRepartitionByExpression(numPartitions, param.tail)
Review comment:
Yeah, I tried to keep consistent with `Dataset.repartition()`. The latter
has two methods `repartition(numPartitions: Int)` and
`repartition(numPartitions: Int, partitionExprs: Column*)`
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