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This module bridges Table/SQL API and runtime. It contains all resources that are required during pre-flight and runtime phase.

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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

/**
 * This package contains the base class of AST nodes and all the expression language AST classes.
 * Expression trees should not be manually constructed by users. They are implicitly constructed
 * from the implicit DSL conversions in
 * [[org.apache.flink.table.api.scala.ImplicitExpressionConversions]] and
 * [[org.apache.flink.table.api.scala.ImplicitExpressionOperations]]. For the Java API,
 * expression trees should be generated from a string parser that parses expressions and creates
 * AST nodes.
 */
package object expressions