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[enhancement](nereids) support approx_count_distinct function (#15406)

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starocean999
2022-12-27 22:25:21 +08:00
committed by GitHub
parent c63dda99db
commit 51b14c06d3
5 changed files with 91 additions and 2 deletions
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5
fe/fe-core/src/main/java/org/apache/doris/catalog/BuiltinAggregateFunctions.java
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@ -17,6 +17,7 @@
package org.apache.doris.catalog;
import org.apache.doris.nereids.trees.expressions.functions.agg.ApproxCountDistinct;
import org.apache.doris.nereids.trees.expressions.functions.agg.Avg;
import org.apache.doris.nereids.trees.expressions.functions.agg.BitmapIntersect;
import org.apache.doris.nereids.trees.expressions.functions.agg.BitmapUnion;
@ -59,8 +60,8 @@ public class BuiltinAggregateFunctions implements FunctionHelper {
agg(GroupBitAnd.class, "group_bit_and"),
agg(GroupBitOr.class, "group_bit_or"),
agg(GroupBitXor.class, "group_bit_xor"),
agg(Ndv.class)
agg(Ndv.class),
agg(ApproxCountDistinct.class, "approx_count_distinct")
);
public static final BuiltinAggregateFunctions INSTANCE = new BuiltinAggregateFunctions();

76
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/agg/ApproxCountDistinct.java Normal file
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@ -0,0 +1,76 @@
// 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.doris.nereids.trees.expressions.functions.agg;
import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.AlwaysNotNullable;
import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.BigIntType;
import org.apache.doris.nereids.types.DataType;
import org.apache.doris.nereids.util.ExpressionUtils;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import java.util.List;
/** MultiDistinctCount */
public class ApproxCountDistinct extends AggregateFunction
implements AlwaysNotNullable, ExplicitlyCastableSignature {
public ApproxCountDistinct(Expression arg0, Expression... varArgs) {
super("approx_count_distinct", false, ExpressionUtils.mergeArguments(arg0, varArgs));
}
public ApproxCountDistinct(boolean isDistinct, Expression arg0, Expression... varArgs) {
super("approx_count_distinct", false, ExpressionUtils.mergeArguments(arg0, varArgs));
}
@Override
public List<FunctionSignature> getSignatures() {
List<DataType> argumentsTypes = getArgumentsTypes();
return ImmutableList.of(FunctionSignature.of(BigIntType.INSTANCE, (List) argumentsTypes));
}
@Override
public ApproxCountDistinct withChildren(List<Expression> children) {
Preconditions.checkArgument(children.size() > 0);
if (children.size() > 1) {
return new ApproxCountDistinct(children.get(0),
children.subList(1, children.size()).toArray(new Expression[0]));
} else {
return new ApproxCountDistinct(children.get(0));
}
}
@Override
public ApproxCountDistinct withDistinctAndChildren(boolean isDistinct, List<Expression> children) {
if (children.size() > 1) {
return new ApproxCountDistinct(isDistinct, children.get(0),
children.subList(1, children.size()).toArray(new Expression[0]));
} else {
return new ApproxCountDistinct(isDistinct, children.get(0));
}
}
@Override
public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
return visitor.visitApproxCountDistinct(this, context);
}
}

5
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/visitor/AggregateFunctionVisitor.java
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@ -18,6 +18,7 @@
package org.apache.doris.nereids.trees.expressions.visitor;
import org.apache.doris.nereids.trees.expressions.functions.agg.AggregateFunction;
import org.apache.doris.nereids.trees.expressions.functions.agg.ApproxCountDistinct;
import org.apache.doris.nereids.trees.expressions.functions.agg.Avg;
import org.apache.doris.nereids.trees.expressions.functions.agg.BitmapUnionCount;
import org.apache.doris.nereids.trees.expressions.functions.agg.Count;
@ -92,4 +93,8 @@ public interface AggregateFunctionVisitor<R, C> {
default R visitHllUnion(HllUnion hllUnion, C context) {
return visitAggregateFunction(hllUnion, context);
}
default R visitApproxCountDistinct(ApproxCountDistinct approxCountDistinct, C context) {
return visitAggregateFunction(approxCountDistinct, context);
}
}