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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.druid.sql.calcite.planner;

import org.apache.druid.math.expr.Expr;
import org.apache.druid.math.expr.Parser;

/**
 * Like {@link Parser#parse}, but allows caching via {@link ExpressionParserImpl}.
 */
public interface ExpressionParser
{
  /**
   * Parse a string into a flattened {@link Expr}. Parsing is eager and the results may be cached.
   */
  Expr parse(String expr);
}