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/*
* 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.expressions;
import org.apache.flink.table.expressions.ApiExpressionUtils;
import org.apache.flink.table.expressions.Expression;
import org.apache.flink.table.expressions.ExpressionDefaultVisitor;
import org.apache.flink.table.expressions.ResolvedExpression;
import org.apache.flink.table.expressions.UnresolvedCallExpression;
import org.apache.flink.table.expressions.UnresolvedReferenceExpression;
import org.apache.flink.table.planner.calcite.FlinkTypeFactory;
import org.apache.flink.table.planner.calcite.RexDistinctKeyVariable;
import org.apache.flink.table.planner.functions.aggfunctions.DeclarativeAggregateFunction;
import org.apache.flink.table.types.logical.LogicalType;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rex.RexInputRef;
import org.apache.calcite.tools.RelBuilder;
import org.apache.commons.lang3.ArrayUtils;
import java.util.stream.Collectors;
import static org.apache.flink.table.runtime.types.LogicalTypeDataTypeConverter.fromLogicalTypeToDataType;
/** Abstract class to resolve the expressions in {@link DeclarativeAggregateFunction}. */
public abstract class DeclarativeExpressionResolver
extends ExpressionDefaultVisitor {
private final DeclarativeAggregateFunction function;
private final boolean isMerge;
private final CallExpressionResolver resolver;
public DeclarativeExpressionResolver(
RelBuilder relBuilder, DeclarativeAggregateFunction function, boolean isMerge) {
this.function = function;
this.isMerge = isMerge;
this.resolver = new CallExpressionResolver(relBuilder);
}
@Override
protected ResolvedExpression defaultMethod(Expression expression) {
if (expression instanceof UnresolvedReferenceExpression) {
UnresolvedReferenceExpression expr = (UnresolvedReferenceExpression) expression;
String name = expr.getName();
int localIndex = ArrayUtils.indexOf(function.aggBufferAttributes(), expr);
if (localIndex == -1) {
// We always use UnresolvedFieldReference to represent reference of input field.
// In non-merge case, the input is operand of the aggregate function. But in merge
// case, the input is aggregate buffers which sent by local aggregate.
if (isMerge) {
return toMergeInputExpr(
name, ArrayUtils.indexOf(function.mergeOperands(), expr));
} else {
return toAccInputExpr(name, ArrayUtils.indexOf(function.operands(), expr));
}
} else {
return toAggBufferExpr(name, localIndex);
}
} else if (expression instanceof UnresolvedCallExpression) {
UnresolvedCallExpression unresolvedCall = (UnresolvedCallExpression) expression;
return resolver.resolve(
ApiExpressionUtils.unresolvedCall(
unresolvedCall.getFunctionDefinition(),
unresolvedCall.getChildren().stream()
.map(c -> c.accept(DeclarativeExpressionResolver.this))
.collect(Collectors.toList())));
} else if (expression instanceof ResolvedExpression) {
return (ResolvedExpression) expression;
} else {
return resolver.resolve(expression);
}
}
/** When merge phase, for inputs. */
public abstract ResolvedExpression toMergeInputExpr(String name, int localIndex);
/** When accumulate phase, for inputs. */
public abstract ResolvedExpression toAccInputExpr(String name, int localIndex);
/** For aggregate buffer. */
public abstract ResolvedExpression toAggBufferExpr(String name, int localIndex);
public static ResolvedExpression toRexInputRef(RelBuilder builder, int i, LogicalType t) {
RelDataType tp =
((FlinkTypeFactory) builder.getTypeFactory()).createFieldTypeFromLogicalType(t);
return new RexNodeExpression(
new RexInputRef(i, tp), fromLogicalTypeToDataType(t), null, null);
}
public static ResolvedExpression toRexDistinctKey(
RelBuilder builder, String name, LogicalType t) {
return new RexNodeExpression(
new RexDistinctKeyVariable(
name,
((FlinkTypeFactory) builder.getTypeFactory())
.createFieldTypeFromLogicalType(t),
t),
fromLogicalTypeToDataType(t),
null,
null);
}
}