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 *
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package org.apache.spark.sql.catalyst.optimizer

import org.apache.spark.sql.catalyst.expressions.SubqueryExpression
import org.apache.spark.sql.catalyst.plans.logical.{DeleteFromTable, Filter, LogicalPlan}
import org.apache.spark.sql.catalyst.rules.Rule
import org.apache.spark.sql.catalyst.utils.PlanUtils.isIcebergRelation

// a temp solution until PullupCorrelatedPredicates handles row-level operations in Spark
object PullupCorrelatedPredicatesInRowLevelOperations extends Rule[LogicalPlan] {
  override def apply(plan: LogicalPlan): LogicalPlan = plan transform {
    case d @ DeleteFromTable(table, Some(cond)) if SubqueryExpression.hasSubquery(cond) && isIcebergRelation(table) =>
      // Spark pulls up correlated predicates only for UnaryNodes
      // DeleteFromTable does not extend UnaryNode so it is ignored in that rule
      // We have this workaround until it is fixed in Spark
      val filter = Filter(cond, table)
      val transformedFilter = PullupCorrelatedPredicates.apply(filter)
      val transformedCond = transformedFilter.asInstanceOf[Filter].condition
      d.copy(condition = Some(transformedCond))
  }
}