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A table format for huge analytic datasets
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iceberg.spark.procedures;

import org.apache.iceberg.actions.Actions;
import org.apache.iceberg.actions.ExpireSnapshotsAction;
import org.apache.iceberg.actions.ExpireSnapshotsActionResult;
import org.apache.iceberg.spark.procedures.SparkProcedures.ProcedureBuilder;
import org.apache.spark.sql.catalyst.InternalRow;
import org.apache.spark.sql.catalyst.util.DateTimeUtils;
import org.apache.spark.sql.connector.catalog.Identifier;
import org.apache.spark.sql.connector.catalog.TableCatalog;
import org.apache.spark.sql.connector.iceberg.catalog.ProcedureParameter;
import org.apache.spark.sql.types.DataTypes;
import org.apache.spark.sql.types.Metadata;
import org.apache.spark.sql.types.StructField;
import org.apache.spark.sql.types.StructType;

/**
 * A procedure that expires snapshots in a table.
 *
 * @see Actions#expireSnapshots()
 */
public class ExpireSnapshotsProcedure extends BaseProcedure {

  private static final ProcedureParameter[] PARAMETERS = new ProcedureParameter[] {
      ProcedureParameter.required("table", DataTypes.StringType),
      ProcedureParameter.optional("older_than", DataTypes.TimestampType),
      ProcedureParameter.optional("retain_last", DataTypes.IntegerType)
  };

  private static final StructType OUTPUT_TYPE = new StructType(new StructField[]{
      new StructField("deleted_data_files_count", DataTypes.LongType, true, Metadata.empty()),
      new StructField("deleted_manifest_files_count", DataTypes.LongType, true, Metadata.empty()),
      new StructField("deleted_manifest_lists_count", DataTypes.LongType, true, Metadata.empty())
  });

  public static ProcedureBuilder builder() {
    return new BaseProcedure.Builder() {
      @Override
      protected ExpireSnapshotsProcedure doBuild() {
        return new ExpireSnapshotsProcedure(tableCatalog());
      }
    };
  }

  private ExpireSnapshotsProcedure(TableCatalog tableCatalog) {
    super(tableCatalog);
  }

  @Override
  public ProcedureParameter[] parameters() {
    return PARAMETERS;
  }

  @Override
  public StructType outputType() {
    return OUTPUT_TYPE;
  }

  @Override
  public InternalRow[] call(InternalRow args) {
    Identifier tableIdent = toIdentifier(args.getString(0), PARAMETERS[0].name());
    Long olderThanMillis = args.isNullAt(1) ? null : DateTimeUtils.toMillis(args.getLong(1));
    Integer retainLastNum = args.isNullAt(2) ? null : args.getInt(2);

    return modifyIcebergTable(tableIdent, table -> {
      Actions actions = Actions.forTable(table);

      ExpireSnapshotsAction action = actions.expireSnapshots();

      if (olderThanMillis != null) {
        action.expireOlderThan(olderThanMillis);
      }

      if (retainLastNum != null) {
        action.retainLast(retainLastNum);
      }

      ExpireSnapshotsActionResult result = action.execute();

      InternalRow outputRow = newInternalRow(
          result.dataFilesDeleted(),
          result.manifestFilesDeleted(),
          result.manifestListsDeleted());
      return new InternalRow[]{outputRow};
    });
  }

  @Override
  public String description() {
    return "ExpireSnapshotProcedure";
  }
}