HyukjinKwon 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_r338391078
########## 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) + case param @ Seq(numPartitions: Int, _*) if shuffle => + createRepartitionByExpression(numPartitions, param.tail) + case param @ Seq(_*) if shuffle => + createRepartitionByExpression(conf.numShufflePartitions, param) + } + } + + /** + * This function handles hints for "REPARTITIONBYRANGE". + * The "REPARTITIONBYRANGE" hint must have column names and a partition number is optional. + */ + private def createRepartitionByRange(hint: UnresolvedHint): RepartitionByExpression = { + val hintName = hint.name.toUpperCase(Locale.ROOT) + + def createRepartitionByExpression( Review comment: `createRepartitionByExpression` seems duplicated. Can we just make one private function to share? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org