clintropolis commented on a change in pull request #12145: URL: https://github.com/apache/druid/pull/12145#discussion_r782719975
########## File path: sql/src/main/java/org/apache/druid/sql/calcite/aggregation/builtin/EarliestLatestBySqlAggregator.java ########## @@ -0,0 +1,180 @@ +/* + * 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.druid.sql.calcite.aggregation.builtin; + +import org.apache.calcite.rel.core.AggregateCall; +import org.apache.calcite.rel.core.Project; +import org.apache.calcite.rex.RexBuilder; +import org.apache.calcite.rex.RexLiteral; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.sql.SqlAggFunction; +import org.apache.calcite.sql.SqlFunctionCategory; +import org.apache.calcite.sql.SqlKind; +import org.apache.calcite.sql.type.InferTypes; +import org.apache.calcite.sql.type.OperandTypes; +import org.apache.calcite.sql.type.SqlReturnTypeInference; +import org.apache.calcite.util.Optionality; +import org.apache.druid.java.util.common.IAE; +import org.apache.druid.java.util.common.ISE; +import org.apache.druid.java.util.common.StringUtils; +import org.apache.druid.query.aggregation.AggregatorFactory; +import org.apache.druid.query.aggregation.post.FinalizingFieldAccessPostAggregator; +import org.apache.druid.segment.column.ColumnType; +import org.apache.druid.segment.column.RowSignature; +import org.apache.druid.sql.calcite.aggregation.Aggregation; +import org.apache.druid.sql.calcite.aggregation.SqlAggregator; +import org.apache.druid.sql.calcite.expression.DruidExpression; +import org.apache.druid.sql.calcite.expression.Expressions; +import org.apache.druid.sql.calcite.planner.Calcites; +import org.apache.druid.sql.calcite.planner.PlannerContext; +import org.apache.druid.sql.calcite.rel.VirtualColumnRegistry; + +import javax.annotation.Nullable; +import java.util.Collections; +import java.util.List; +import java.util.stream.Collectors; + +public class EarliestLatestBySqlAggregator implements SqlAggregator +{ + public static final SqlAggregator EARLIEST_BY = new EarliestLatestBySqlAggregator(EarliestLatestAnySqlAggregator.AggregatorType.EARLIEST); + public static final SqlAggregator LATEST_BY = new EarliestLatestBySqlAggregator(EarliestLatestAnySqlAggregator.AggregatorType.LATEST); + + private final EarliestLatestAnySqlAggregator.AggregatorType aggregatorType; + private final SqlAggFunction function; + + private EarliestLatestBySqlAggregator(final EarliestLatestAnySqlAggregator.AggregatorType aggregatorType) + { + this.aggregatorType = aggregatorType; + this.function = new EarliestByLatestBySqlAggFunction(aggregatorType); + } + + @Override + public SqlAggFunction calciteFunction() + { + return function; + } + + @Nullable + @Override + public Aggregation toDruidAggregation( + final PlannerContext plannerContext, + final RowSignature rowSignature, + final VirtualColumnRegistry virtualColumnRegistry, + final RexBuilder rexBuilder, + final String name, + final AggregateCall aggregateCall, + final Project project, + final List<Aggregation> existingAggregations, + final boolean finalizeAggregations + ) + { + final List<RexNode> rexNodes = aggregateCall + .getArgList() + .stream() + .map(i -> Expressions.fromFieldAccess(rowSignature, project, i)) + .collect(Collectors.toList()); + + final List<DruidExpression> args = Expressions.toDruidExpressions(plannerContext, rowSignature, rexNodes); + + if (args == null) { + return null; + } + + final String aggregatorName = finalizeAggregations ? Calcites.makePrefixedName(name, "a") : name; + final ColumnType outputType = Calcites.getColumnTypeForRelDataType(aggregateCall.getType()); + if (outputType == null) { + throw new ISE( + "Cannot translate output sqlTypeName[%s] to Druid type for aggregator[%s]", + aggregateCall.getType().getSqlTypeName(), + aggregateCall.getName() + ); + } + + final String fieldName = EarliestLatestAnySqlAggregator.getColumnName(plannerContext, virtualColumnRegistry, args.get(0), rexNodes.get(0)); + + final AggregatorFactory theAggFactory; + switch (args.size()) { + case 2: + theAggFactory = aggregatorType.createAggregatorFactory( + aggregatorName, + fieldName, + EarliestLatestAnySqlAggregator.getColumnName(plannerContext, virtualColumnRegistry, args.get(1), rexNodes.get(1)), + outputType, + -1 + ); + break; + case 3: + theAggFactory = aggregatorType.createAggregatorFactory( + aggregatorName, + fieldName, + EarliestLatestAnySqlAggregator.getColumnName(plannerContext, virtualColumnRegistry, args.get(2), rexNodes.get(2)), + outputType, + RexLiteral.intValue(rexNodes.get(1)) + ); + break; + default: + throw new IAE( + "aggregation[%s], Invalid number of arguments[%,d] to [%s] operator", + aggregatorName, + args.size(), + aggregatorType.name() + ); + } + + return Aggregation.create( + Collections.singletonList(theAggFactory), + finalizeAggregations ? new FinalizingFieldAccessPostAggregator(name, aggregatorName) : null + ); + } + + private static class EarliestByLatestBySqlAggFunction extends SqlAggFunction + { + private static final SqlReturnTypeInference EARLIEST_LATEST_ARG0_RETURN_TYPE_INFERENCE = + new EarliestLatestAnySqlAggregator.EarliestLatestReturnTypeInference(0); + + EarliestByLatestBySqlAggFunction(EarliestLatestAnySqlAggregator.AggregatorType aggregatorType) + { + super( + StringUtils.format("%s_BY", aggregatorType.name()), + null, + SqlKind.OTHER_FUNCTION, + EARLIEST_LATEST_ARG0_RETURN_TYPE_INFERENCE, + InferTypes.RETURN_TYPE, + OperandTypes.or( + OperandTypes.sequence( + "'" + aggregatorType.name() + "(expr, timeColumn)'\n", + OperandTypes.ANY, + OperandTypes.NUMERIC Review comment: changed, and this found a bug when i had to switch to column that could actually be converted to TIMESTAMP (a long), we weren't correctly checking if the time column selector had null values, so I've fixed up the native aggregators to handle this case. -- This is an automated message from the Apache Git Service. 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