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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
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 * See the License for the specific language governing permissions and
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package org.apache.paimon.spark.catalyst.analysis

import org.apache.paimon.spark.commands.DeleteFromPaimonTableCommand
import org.apache.paimon.table.FileStoreTable

import org.apache.spark.sql.catalyst.plans.logical.{AnalysisHelper, DeleteFromTable, LogicalPlan}
import org.apache.spark.sql.catalyst.rules.Rule

object PaimonDeleteTable extends Rule[LogicalPlan] with RowLevelHelper {

  override val operation: RowLevelOp = Delete

  override def apply(plan: LogicalPlan): LogicalPlan = {
    // Spark 4.1 moved RewriteDeleteFromTable from the "DML rewrite" batch into the main Resolution
    // batch, which marks the plan analyzed before the Post-Hoc Resolution batch runs.
    // `plan.resolveOperators` then short-circuits on the already-analyzed DELETE node and the
    // physical planner rejects it with "Table does not support DELETE FROM". Use `transformDown`
    // (which unconditionally visits every node) guarded by
    // `AnalysisHelper.allowInvokingTransformsInAnalyzer` so the in-analyzer assertion does not
    // trip.
    AnalysisHelper.allowInvokingTransformsInAnalyzer {
      plan.transformDown {
        case d @ DeleteFromTable(PaimonRelation(table), condition)
            if d.resolved && shouldFallbackToV1Delete(table, condition) =>
          checkPaimonTable(table.getTable)

          table.getTable match {
            case paimonTable: FileStoreTable =>
              val relation = PaimonRelation.getPaimonRelation(d.table)
              if (
                paimonTable.coreOptions().dataEvolutionEnabled()
                && !paimonTable.coreOptions().deletionVectorsEnabled()
              ) {
                throw new RuntimeException(
                  "Can only perform deletion operation on data evolution tables with DeletionVector enabled.")
              }
              DeleteFromPaimonTableCommand(relation, paimonTable, condition)

            case _ =>
              throw new RuntimeException("Delete Operation is only supported for FileStoreTable.")
          }
      }
    }
  }
}
