ngsg commented on code in PR #4115: URL: https://github.com/apache/hive/pull/4115#discussion_r1316783464
########## ql/src/java/org/apache/hadoop/hive/ql/optimizer/ExtendParentReduceSinkOfMapJoin.java: ########## @@ -0,0 +1,205 @@ +/* + * 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.hadoop.hive.ql.optimizer; + +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Stack; + +import org.apache.hadoop.hive.ql.exec.ColumnInfo; +import org.apache.hadoop.hive.ql.exec.MapJoinOperator; +import org.apache.hadoop.hive.ql.exec.ReduceSinkOperator; +import org.apache.hadoop.hive.ql.exec.Utilities; +import org.apache.hadoop.hive.ql.lib.Node; +import org.apache.hadoop.hive.ql.lib.NodeProcessorCtx; +import org.apache.hadoop.hive.ql.lib.SemanticNodeProcessor; +import org.apache.hadoop.hive.ql.parse.SemanticException; +import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc; +import org.apache.hadoop.hive.ql.plan.ExprNodeDesc; +import org.apache.hadoop.hive.ql.plan.ExprNodeDescUtils; +import org.apache.hadoop.hive.ql.plan.ExprNodeGenericFuncDesc; +import org.apache.hadoop.hive.ql.plan.MapJoinDesc; +import org.apache.hadoop.hive.ql.plan.PlanUtils; +import org.apache.hadoop.hive.ql.plan.ReduceSinkDesc; +import org.apache.hadoop.hive.ql.plan.TableDesc; +import org.apache.hadoop.hive.ql.udf.UDFToShort; +import org.apache.hadoop.hive.ql.udf.generic.GenericUDFBridge; +import org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPMultiply; +import org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPNot; +import org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPPlus; +import org.apache.hadoop.hive.serde.serdeConstants; +import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo; +import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory; + +public class ExtendParentReduceSinkOfMapJoin implements SemanticNodeProcessor { + + private final TypeInfo shortType = TypeInfoFactory.getPrimitiveTypeInfo(serdeConstants.SMALLINT_TYPE_NAME); + + @Override + public Object process(Node nd, Stack<Node> stack, NodeProcessorCtx procCtx, Object... nodeOutputs) + throws SemanticException { + MapJoinOperator mapJoinOp = (MapJoinOperator) nd; + MapJoinDesc mapJoinDesc = mapJoinOp.getConf(); + + if (mapJoinDesc.getFilterMap() != null) { + int[][] filterMap = mapJoinDesc.getFilterMap(); + + // 1. Extend ReduceSinkoperator if it's output is filtered by MapJoinOperator. + for (byte pos = 0; pos < filterMap.length; pos++) { + if (pos == mapJoinDesc.getPosBigTable() || filterMap[pos] == null) { + continue; + } + + ExprNodeDesc filterTagExpr = + generateFilterTagExpression(filterMap[pos], mapJoinDesc.getFilters().get(pos)); + + // Note that the parent RS for the given pos is retrieved in different way in MapJoinProcessor. + // TODO: MapJoinProcessor.convertMapJoin() fixes the order of parent operators. + // Does other callers also fix the order as well as MapJoinProcessor.convertMapJoin()? + ReduceSinkOperator parent = (ReduceSinkOperator) mapJoinOp.getParentOperators().get(pos); + ReduceSinkDesc pRsConf = parent.getConf(); + + // MapJoinProcessor.getMapJoinDesc() replaces filter expressions with backtracked one if + // adjustParentsChildren is true. + // As of now, ConvertJoinMapJoin.convertJoinDynamicPartitionedHashJoin() is the only functions that + // calls this method with adjustParentsChildren = false. Therefore, we backtrack filter expressions + // only if MapJoinDesc.isDynamicPartitionHashJoin is true, which is also the unique property of + // ConvertJoinMapJoin.convertJoinDynamicPartitionedHashJoin(). + ExprNodeDesc mapSideFilterTagExpr; + if (mapJoinDesc.isDynamicPartitionHashJoin()) { + mapSideFilterTagExpr = ExprNodeDescUtils.backtrack(filterTagExpr, mapJoinOp, parent); + } else { + mapSideFilterTagExpr = filterTagExpr; + } + String filterColumnName = "_filterTag"; + + pRsConf.getValueCols().add(mapSideFilterTagExpr); + pRsConf.getOutputValueColumnNames().add(filterColumnName); + pRsConf.getColumnExprMap() + .put(Utilities.ReduceField.VALUE + "." + filterColumnName, mapSideFilterTagExpr); + + ColumnInfo filterTagColumnInfo = + new ColumnInfo(Utilities.ReduceField.VALUE + "." + filterColumnName, shortType, "", false); + parent.getSchema().getSignature().add(filterTagColumnInfo); + + TableDesc newTableDesc = + PlanUtils.getReduceValueTableDesc( + PlanUtils.getFieldSchemasFromColumnList(pRsConf.getValueCols(), "_col")); + pRsConf.setValueSerializeInfo(newTableDesc); + } + + // 2. Update MapJoinOperator's valueFilteredTableDescs. + // Unlike HashTableSinkOperator used in MR engine, Tez engine directly passes rows from RS to MapJoin. + // Therefore, RS's writer and MapJoin's reader should have the same TableDesc. We create valueTableDesc + // here again because it can be different from RS's valueSerializeInfo due to ColumnPruner. + List<TableDesc> newMapJoinValueFilteredTableDescs = new ArrayList<>(); + for (byte pos = 0; pos < mapJoinOp.getParentOperators().size(); pos++) { + TableDesc tableDesc; + + if (pos == mapJoinDesc.getPosBigTable() || filterMap[pos] == null) { + // We did not change corresponding parent operator. Use the original tableDesc. + tableDesc = mapJoinDesc.getValueFilteredTblDescs().get(pos); + } else { + // Create a new TableDesc based on corresponding parent RSOperator. + ReduceSinkOperator parent = (ReduceSinkOperator) mapJoinOp.getParentOperators().get(pos); + ReduceSinkDesc pRsConf = parent.getConf(); + + tableDesc = + PlanUtils.getMapJoinValueTableDesc( + PlanUtils.getFieldSchemasFromColumnList(pRsConf.getValueCols(), "mapjoinvalue")); + } + + newMapJoinValueFilteredTableDescs.add(tableDesc); + } + mapJoinDesc.setValueFilteredTblDescs(newMapJoinValueFilteredTableDescs); + } + + return null; + } + + private ExprNodeDesc generateFilterTagExpression(int[] filterMap, List<ExprNodeDesc> filterExprs) { + ExprNodeDesc filterTagExpr = new ExprNodeConstantDesc(shortType, (short) 0); + Map<Byte, ExprNodeDesc> filterExprMap = getFilterExprMap(filterMap, filterExprs); + + for (Map.Entry<Byte, ExprNodeDesc> entry: filterExprMap.entrySet()) { + ExprNodeDesc filterTagMaskExpr = generateFilterTagMask(entry.getKey(), entry.getValue()); + + if (filterTagExpr instanceof ExprNodeConstantDesc) { + filterTagExpr = filterTagMaskExpr; + } else { + List<ExprNodeDesc> plusArgs = new ArrayList<>(2); + plusArgs.add(filterTagMaskExpr); + plusArgs.add(filterTagExpr); + filterTagExpr = new ExprNodeGenericFuncDesc(shortType, new GenericUDFOPPlus(), plusArgs); + } + } + + return filterTagExpr; + } + + private Map<Byte, ExprNodeDesc> getFilterExprMap(int[] filterInfo, List<ExprNodeDesc> filterExprs) { + Map<Byte, ExprNodeDesc> filterExprMap = new HashMap<>(); + + int exprListOffset = 0; + for (int idx = 0; idx < filterInfo.length; idx = idx + 2) { + byte tag = (byte) filterInfo[idx]; + int length = filterInfo[idx + 1]; + + int nextExprOffset = exprListOffset + length; + List<ExprNodeDesc> andArgs = filterExprs.subList(exprListOffset, nextExprOffset); + exprListOffset = nextExprOffset; + + if (andArgs.size() == 1) { + filterExprMap.put(tag, andArgs.get(0)); + } else if (andArgs.size() > 1) { + filterExprMap.put(tag, ExprNodeDescUtils.and(andArgs)); + } + } + + return filterExprMap; + } + + private ExprNodeDesc generateFilterTagMask(byte tag, ExprNodeDesc condition) { Review Comment: I added a comment that explains the computation performed by the resultant ExprNodeDesc. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org
