iyupeng commented on a change in pull request #17344: URL: https://github.com/apache/flink/pull/17344#discussion_r735217760
########## File path: flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/abilities/source/AggregatePushDownSpec.java ########## @@ -0,0 +1,199 @@ +/* + * 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.flink.table.planner.plan.abilities.source; + +import org.apache.flink.table.api.TableException; +import org.apache.flink.table.connector.source.DynamicTableSource; +import org.apache.flink.table.connector.source.abilities.SupportsAggregatePushDown; +import org.apache.flink.table.expressions.AggregateExpression; +import org.apache.flink.table.expressions.FieldReferenceExpression; +import org.apache.flink.table.planner.functions.aggfunctions.AvgAggFunction; +import org.apache.flink.table.planner.functions.aggfunctions.CountAggFunction; +import org.apache.flink.table.planner.functions.aggfunctions.Sum0AggFunction; +import org.apache.flink.table.planner.plan.utils.AggregateInfo; +import org.apache.flink.table.planner.plan.utils.AggregateInfoList; +import org.apache.flink.table.planner.plan.utils.AggregateUtil; +import org.apache.flink.table.planner.utils.JavaScalaConversionUtil; +import org.apache.flink.table.types.DataType; +import org.apache.flink.table.types.logical.RowType; +import org.apache.flink.table.types.utils.TypeConversions; + +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonCreator; +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonProperty; +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.annotation.JsonTypeName; + +import org.apache.calcite.rel.core.AggregateCall; +import org.apache.commons.lang3.ArrayUtils; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.List; +import java.util.stream.Collectors; + +import scala.Tuple2; + +import static org.apache.flink.util.Preconditions.checkArgument; +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * A sub-class of {@link SourceAbilitySpec} that can not only serialize/deserialize the aggregation + * to/from JSON, but also can push the local aggregate into a {@link SupportsAggregatePushDown}. + */ +@JsonTypeName("AggregatePushDown") +public class AggregatePushDownSpec extends SourceAbilitySpecBase { + + public static final String FIELD_NAME_INPUT_TYPE = "inputType"; + + public static final String FIELD_NAME_GROUPING_SETS = "groupingSets"; + + public static final String FIELD_NAME_AGGREGATE_CALLS = "aggregateCalls"; + + @JsonProperty(FIELD_NAME_INPUT_TYPE) + private final RowType inputType; + + @JsonProperty(FIELD_NAME_GROUPING_SETS) + private final List<int[]> groupingSets; + + @JsonProperty(FIELD_NAME_AGGREGATE_CALLS) + private final List<AggregateCall> aggregateCalls; + + @JsonCreator + public AggregatePushDownSpec( + @JsonProperty(FIELD_NAME_INPUT_TYPE) RowType inputType, + @JsonProperty(FIELD_NAME_GROUPING_SETS) List<int[]> groupingSets, + @JsonProperty(FIELD_NAME_AGGREGATE_CALLS) List<AggregateCall> aggregateCalls, + @JsonProperty(FIELD_NAME_PRODUCED_TYPE) RowType producedType) { + super(producedType); + + this.inputType = inputType; + this.groupingSets = new ArrayList<>(checkNotNull(groupingSets)); + this.aggregateCalls = aggregateCalls; + } + + @Override + public void apply(DynamicTableSource tableSource, SourceAbilityContext context) { + checkArgument(getProducedType().isPresent()); + apply(inputType, groupingSets, aggregateCalls, getProducedType().get(), tableSource); + } + + @Override + public String getDigests(SourceAbilityContext context) { + int[] grouping = ArrayUtils.addAll(groupingSets.get(0), groupingSets.get(1)); + String groupingStr = + Arrays.stream(grouping) + .mapToObj(index -> inputType.getFieldNames().get(index)) + .collect(Collectors.joining(",")); + + List<AggregateExpression> aggregateExpressions = + buildAggregateExpressions(inputType, aggregateCalls); + String aggFunctionsStr = + aggregateExpressions.stream() + .map(AggregateExpression::asSummaryString) + .collect(Collectors.joining(",")); + + return "aggregates=[grouping=[" + + groupingStr + + "], aggFunctions=[" + + aggFunctionsStr + + "]]"; + } + + public static boolean apply( + RowType inputType, + List<int[]> groupingSets, + List<AggregateCall> aggregateCalls, + RowType producedType, + DynamicTableSource tableSource) { + List<AggregateExpression> aggregateExpressions = + buildAggregateExpressions(inputType, aggregateCalls); + + if (tableSource instanceof SupportsAggregatePushDown) { + DataType producedDataType = TypeConversions.fromLogicalToDataType(producedType); + return ((SupportsAggregatePushDown) tableSource) + .applyAggregates(groupingSets, aggregateExpressions, producedDataType); + } else { + throw new TableException( + String.format( + "%s does not support SupportsAggregatePushDown.", + tableSource.getClass().getName())); + } + } + + private static List<AggregateExpression> buildAggregateExpressions( + RowType inputType, List<AggregateCall> aggregateCalls) { + AggregateInfoList aggInfoList = + AggregateUtil.transformToBatchAggregateInfoList( Review comment: added an assertion in `apply` function to check `batch` mode -- This is an automated message from the Apache Git Service. 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