/**
 * Copyright (c) 2020-present, Goldman Sachs
 *
 * Licensed 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.
 */
import { type Hashable } from '@finos/legend-shared';
import type { AbstractPropertyExpression, PureModel, SimpleFunctionExpression, Type, ValueSpecification, VariableExpression } from '@finos/legend-graph';
import { type QueryBuilderProjectionColumnState } from '../projection/QueryBuilderProjectionColumnState.js';
import type { QueryBuilderAggregateColumnState } from './QueryBuilderAggregationState.js';
export declare abstract class QueryBuilderAggregateOperator implements Hashable {
    readonly uuid: string;
    constructor();
    abstract getLabel(projectionColumnState: QueryBuilderProjectionColumnState): string;
    abstract isCompatibleWithColumn(projectionColumnState: QueryBuilderProjectionColumnState): boolean;
    abstract buildAggregateExpression(propertyExpression: AbstractPropertyExpression | undefined, variableName: string, graph: PureModel): ValueSpecification;
    buildAggregateExpressionFromState(aggregateColumnState: QueryBuilderAggregateColumnState): ValueSpecification;
    abstract buildAggregateColumnState(expression: SimpleFunctionExpression, lambdaParam: VariableExpression, projectionColumnState: QueryBuilderProjectionColumnState): QueryBuilderAggregateColumnState | undefined;
    /**
     * Returns the expected return type of the operator.
     * defaults to using the return type of the projection column state which is being aggregated.
     */
    getReturnType(aggregateColumnState: QueryBuilderAggregateColumnState): Type | undefined;
    get getOperator(): QueryBuilderAggregateOperator;
    get allValidationIssues(): string[];
    abstract get hashCode(): string;
}
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