org.apache.spark.sql.catalyst.analysis.SubstituteUnresolvedOrdinals.scala Maven / Gradle / Ivy
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.spark.sql.catalyst.analysis
import org.apache.spark.sql.catalyst.expressions.{Expression, Literal, SortOrder}
import org.apache.spark.sql.catalyst.plans.logical.{Aggregate, LogicalPlan, Sort}
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.catalyst.trees.CurrentOrigin.withOrigin
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types.IntegerType
/**
* Replaces ordinal in 'order by' or 'group by' with UnresolvedOrdinal expression.
*/
class SubstituteUnresolvedOrdinals(conf: SQLConf) extends Rule[LogicalPlan] {
private def isIntLiteral(e: Expression) = e match {
case Literal(_, IntegerType) => true
case _ => false
}
def apply(plan: LogicalPlan): LogicalPlan = plan resolveOperators {
case s: Sort if conf.orderByOrdinal && s.order.exists(o => isIntLiteral(o.child)) =>
val newOrders = s.order.map {
case order @ SortOrder(ordinal @ Literal(index: Int, IntegerType), _, _, _) =>
val newOrdinal = withOrigin(ordinal.origin)(UnresolvedOrdinal(index))
withOrigin(order.origin)(order.copy(child = newOrdinal))
case other => other
}
withOrigin(s.origin)(s.copy(order = newOrders))
case a: Aggregate if conf.groupByOrdinal && a.groupingExpressions.exists(isIntLiteral) =>
val newGroups = a.groupingExpressions.map {
case ordinal @ Literal(index: Int, IntegerType) =>
withOrigin(ordinal.origin)(UnresolvedOrdinal(index))
case other => other
}
withOrigin(a.origin)(a.copy(groupingExpressions = newGroups))
}
}