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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 com.hazelcast.shaded.org.apache.calcite.model;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

import com.hazelcast.shaded.org.checkerframework.checker.nullness.qual.Nullable;

import static java.util.Objects.requireNonNull;

/**
 * An aggregate function applied to a column (or columns) of a lattice.
 *
 * 

Occurs in a {@link com.hazelcast.shaded.org.apache.calcite.model.JsonTile}, * and there is a default list in * {@link com.hazelcast.shaded.org.apache.calcite.model.JsonLattice}. * * @see JsonRoot Description of schema elements */ public class JsonMeasure { /** The name of an aggregate function. * *

Required. Usually {@code count}, {@code sum}, * {@code min}, {@code max}. */ public final String agg; /** Arguments to the measure. * *

Valid values are: *

    *
  • Not specified: no arguments
  • *
  • null: no arguments
  • *
  • Empty list: no arguments
  • *
  • String: single argument, the name of a lattice column
  • *
  • List: multiple arguments, each a column name
  • *
* *

Unlike lattice dimensions, measures can not be specified in qualified * format, {@code ["table", "column"]}. When you define a lattice, make sure * that each column you intend to use as a measure has a unique name within * the lattice (using "{@code AS alias}" if necessary). */ public final @Nullable Object args; @JsonCreator public JsonMeasure( @JsonProperty(value = "agg", required = true) String agg, @JsonProperty("args") @Nullable Object args) { this.agg = requireNonNull(agg, "agg"); this.args = args; } public void accept(ModelHandler modelHandler) { modelHandler.visit(this); } }





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