org.apache.calcite.model.JsonTile Maven / Gradle / Ivy
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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.calcite.model;
import java.util.ArrayList;
import java.util.List;
/**
* Materialized view within a {@link org.apache.calcite.model.JsonLattice}.
*
* A tile is defined in terms of its dimensionality (the grouping columns,
* drawn from the lattice) and measures (aggregate functions applied to
* lattice columns).
*
*
Occurs within {@link JsonLattice#tiles}.
*
* @see JsonRoot Description of schema elements
*/
public class JsonTile {
/** List of dimensions that define this tile.
*
*
Each dimension is a column from the lattice. The list of dimensions
* defines the level of aggregation, like a {@code GROUP BY} clause.
*
*
Required, but may be empty. Each element is either a string
* (the unique label of the column within the lattice)
* or a string list (a pair consisting of a table alias and a column name).
*/
public final List dimensions = new ArrayList();
/** List of measures in this tile.
*
*
If not specified, uses {@link JsonLattice#defaultMeasures}.
*/
public List measures;
public void accept(ModelHandler handler) {
handler.visit(this);
}
}
// End JsonTile.java