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Core Calcite APIs and engine.

There is a newer version: 1.17.0-flink-r3

/*
 * 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 com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeInfo;

import java.util.ArrayList;
import java.util.List;

/**
 * Schema schema element.
 *
 * Occurs within {@link JsonRoot#schemas}.
 *
 * @see JsonRoot Description of schema elements
 */
@JsonTypeInfo(
    use = JsonTypeInfo.Id.NAME,
    property = "type",
    defaultImpl = JsonMapSchema.class)
@JsonSubTypes({
    @JsonSubTypes.Type(value = JsonMapSchema.class, name = "map"),
    @JsonSubTypes.Type(value = JsonJdbcSchema.class, name = "jdbc"),
    @JsonSubTypes.Type(value = JsonCustomSchema.class, name = "custom") })
public abstract class JsonSchema {
  /** Name of the schema.
   *
   * 
Required.
   *
   * @see JsonRoot#defaultSchema
   */
  public String name;

  /** SQL path that is used to resolve functions used in this schema.
   *
   * 
May be null, or a list, each element of which is a string or a
   * string-list.
   *
   * 
For example,
   *
   * 
path: [ ['usr', 'lib'], 'lib' ]
   *
   * declares a path with two elements: the schema '/usr/lib' and the schema
   * '/lib'. Most schemas are at the top level, and for these you can use a
   * string.
   */
  public List