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Original file line number Diff line number Diff line change
Expand Up @@ -193,12 +193,16 @@ private LogicalPlan normalizeAgg(LogicalAggregate<Plan> aggregate, LogicalHaving

// push down 3 kinds of exprs, these pushed exprs will be used to normalize agg output later
// 1. group by exprs
// 2. trivalAgg children
// 3. trivalAgg input slots
Set<Expression> allPushDownExprs =
Sets.union(groupingByExprs, Sets.union(needPushSelf, needPushInputSlots));
NormalizeToSlotContext bottomSlotContext =
NormalizeToSlotContext.buildContext(existsAlias, allPushDownExprs);
// 2. trivialAgg children
// 3. trivialAgg input slots
// We need to distinguish between expressions in aggregate function arguments and group by expressions.
NormalizeToSlotContext groupByExprContext = NormalizeToSlotContext.buildContext(existsAlias, groupingByExprs);
Set<Alias> existsAliasAndGroupByAlias = getExistsAlias(existsAlias, groupByExprContext.getNormalizeToSlotMap());
Set<Expression> argsOfAggFuncNeedPushDown = Sets.union(needPushSelf, needPushInputSlots);
NormalizeToSlotContext argsOfAggFuncNeedPushDownContext = NormalizeToSlotContext
.buildContext(existsAliasAndGroupByAlias, argsOfAggFuncNeedPushDown);
NormalizeToSlotContext bottomSlotContext = argsOfAggFuncNeedPushDownContext.mergeContext(groupByExprContext);

Set<NamedExpression> pushedGroupByExprs =
bottomSlotContext.pushDownToNamedExpression(groupingByExprs);
Set<NamedExpression> pushedTrivalAggChildren =
Expand Down Expand Up @@ -258,8 +262,12 @@ private LogicalPlan normalizeAgg(LogicalAggregate<Plan> aggregate, LogicalHaving
aggregate.withNormalized(normalizedGroupExprs, normalizedAggOutput, bottomPlan);

// create upper projects by normalize all output exprs in old LogicalAggregate
// In aggregateOutput, the expressions inside the agg function can be rewritten
// with expressions in aggregate function arguments and group by expressions,
// but the ones outside the agg function can only be rewritten with group by expressions.
// After the above two rewrites are completed, use aggregate output agg functions to rewrite.
List<NamedExpression> upperProjects = normalizeOutput(aggregateOutput,
bottomSlotContext, normalizedAggFuncsToSlotContext);
groupByExprContext, argsOfAggFuncNeedPushDownContext, normalizedAggFuncsToSlotContext);

// create a parent project node
LogicalProject<Plan> project = new LogicalProject(upperProjects, newAggregate);
Expand Down Expand Up @@ -304,11 +312,18 @@ private LogicalPlan normalizeAgg(LogicalAggregate<Plan> aggregate, LogicalHaving
}

private List<NamedExpression> normalizeOutput(List<NamedExpression> aggregateOutput,
NormalizeToSlotContext groupByToSlotContext, NormalizeToSlotContext normalizedAggFuncsToSlotContext) {
NormalizeToSlotContext groupByToSlotContext, NormalizeToSlotContext argsOfAggFuncNeedPushDownContext,
NormalizeToSlotContext normalizedAggFuncsToSlotContext) {
// build upper project, use two context to do pop up, because agg output maybe contain two part:
// group by keys and agg expressions
List<NamedExpression> upperProjects = groupByToSlotContext
.normalizeToUseSlotRefWithoutWindowFunction(aggregateOutput);
// group by keys and agg expressions
List<NamedExpression> upperProjects = new ArrayList<>();
for (Expression expr : aggregateOutput) {
Expression rewrittenExpr = expr.rewriteDownShortCircuit(
e -> normalizeAggFuncChildren(
argsOfAggFuncNeedPushDownContext, e));
upperProjects.add((NamedExpression) rewrittenExpr);
}
upperProjects = groupByToSlotContext.normalizeToUseSlotRefWithoutWindowFunction(upperProjects);
upperProjects = normalizedAggFuncsToSlotContext.normalizeToUseSlotRefWithoutWindowFunction(upperProjects);

Builder<NamedExpression> builder = new ImmutableList.Builder<>();
Expand Down Expand Up @@ -340,4 +355,28 @@ private List<Slot> collectAllUsedSlots(List<NamedExpression> expressions) {
slots.addAll(ExpressionUtils.getInputSlotSet(expressions));
return slots;
}

private Set<Alias> getExistsAlias(Set<Alias> originAliases,
Map<Expression, NormalizeToSlotTriplet> groupingExprMap) {
Set<Alias> existsAlias = Sets.newHashSet();
existsAlias.addAll(originAliases);
for (NormalizeToSlotTriplet triplet : groupingExprMap.values()) {
if (triplet.pushedExpr instanceof Alias) {
Alias alias = (Alias) triplet.pushedExpr;
existsAlias.add(alias);
}
}
return existsAlias;
}

private Expression normalizeAggFuncChildren(NormalizeToSlotContext context, Expression expr) {
if (expr instanceof AggregateFunction) {
AggregateFunction function = (AggregateFunction) expr;
List<Expression> normalizedRealExpressions = context.normalizeToUseSlotRef(function.getArguments());
function = function.withChildren(normalizedRealExpressions);
return function;
} else {
return expr;
}
}
}
Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,17 @@ public NormalizeToSlotContext(Map<Expression, NormalizeToSlotTriplet> normalizeT
this.normalizeToSlotMap = normalizeToSlotMap;
}

public Map<Expression, NormalizeToSlotTriplet> getNormalizeToSlotMap() {
return normalizeToSlotMap;
}

public NormalizeToSlotContext mergeContext(NormalizeToSlotContext context) {
Map<Expression, NormalizeToSlotTriplet> newMap = Maps.newHashMap();
newMap.putAll(this.normalizeToSlotMap);
newMap.putAll(context.getNormalizeToSlotMap());
return new NormalizeToSlotContext(newMap);
}

/**
* build normalization context by follow step.
* 1. collect all exists alias by input parameters existsAliases build a reverted map: expr -> alias
Expand Down
Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
-- This file is automatically generated. You should know what you did if you want to edit this
-- !test_upper_project_projections_rewrite2 --

Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
// 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.
suite("normalize_aggregate") {
sql "SET enable_nereids_planner=true"
sql "SET enable_fallback_to_original_planner=false"

sql "drop table if exists normalize_aggregate_tab"
sql """CREATE TABLE normalize_aggregate_tab(col0 INTEGER, col1 INTEGER, col2 INTEGER) distributed by hash(col0) buckets 10
properties('replication_num' = '1'); """
qt_test_upper_project_projections_rewrite2 """
SELECT - + AVG ( DISTINCT - col0 ) * - col0 FROM
normalize_aggregate_tab WHERE + - col0 IS NULL GROUP BY col0 HAVING NULL IS NULL;"""
}