content: /*
   * 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.test;
  
  import org.apache.calcite.plan.RelTraitDef;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.sql.parser.SqlParser;
  import org.apache.calcite.tools.FrameworkConfig;
  import org.apache.calcite.tools.Frameworks;
  import org.apache.calcite.tools.Programs;
  import org.apache.calcite.tools.RelBuilder;
  
  import java.util.List;
  import java.util.function.Function;
  
  /**
   * The source of a {@link RelNode} for running a test.
   */
  interface RelSupplier {
    RelNode apply(RelOptFixture fixture);
    RelNode apply2(RelMetadataFixture metadataFixture);
  
  
    RelSupplier NONE = new RelSupplier() {
      @Override public RelNode apply(RelOptFixture fixture) {
        throw new UnsupportedOperationException();
      }
  
      @Override public RelNode apply2(RelMetadataFixture metadataFixture) {
        throw new UnsupportedOperationException();
      }
    };
  
    static RelSupplier of(String sql) {
      if (sql.contains(" \n")) {
        throw new AssertionError("trailing whitespace");
      }
      return new SqlRelSupplier(sql);
    }
  
    /**
     * RelBuilder config based on the "scott" schema.
     */
    FrameworkConfig FRAMEWORK_CONFIG =
        Frameworks.newConfigBuilder()
            .parserConfig(SqlParser.Config.DEFAULT)
            .defaultSchema(
                CalciteAssert.addSchema(
                    Frameworks.createRootSchema(true),
                    CalciteAssert.SchemaSpec.SCOTT_WITH_TEMPORAL))
            .traitDefs((List<RelTraitDef>) null)
            .programs(Programs.heuristicJoinOrder(Programs.RULE_SET, true, 2))
            .build();
  
    static RelSupplier of(Function<RelBuilder, RelNode> relFn) {
      return new FnRelSupplier(relFn);
    }
  
    /** Creates a RelNode by parsing SQL. */
    class SqlRelSupplier implements RelSupplier {
      private final String sql;
  
      private SqlRelSupplier(String sql) {
        this.sql = sql;
      }
  
      @Override public String toString() {
        return sql;
      }
  
      @Override public boolean equals(Object o) {
        return o == this
            || o instanceof SqlRelSupplier
            && ((SqlRelSupplier) o).sql.equals(this.sql);
      }
  
      @Override public int hashCode() {
        return 3709 + sql.hashCode();
      }
  
      @Override public RelNode apply(RelOptFixture fixture) {
        String sql2 = fixture.diffRepos().expand("sql", sql);
        return fixture.tester
            .convertSqlToRel(fixture.factory, sql2, fixture.decorrelate,
                fixture.factory.sqlToRelConfig.isTrimUnusedFields())
            .project();
      }
  
      @Override public RelNode apply2(RelMetadataFixture metadataFixture) {
        return metadataFixture.sqlToRel(sql);
      }
    }
  
    /** Creates a RelNode by passing a lambda to a {@link RelBuilder}. */
    class FnRelSupplier implements RelSupplier {
      private final Function<RelBuilder, RelNode> relFn;
  
      private FnRelSupplier(Function<RelBuilder, RelNode> relFn) {
        this.relFn = relFn;
      }
  
      @Override public String toString() {
        return "<relFn>";
      }
  
      @Override public int hashCode() {
        return relFn.hashCode();
      }
  
      @Override public boolean equals(Object o) {
        return o == this
            || o instanceof FnRelSupplier
            && ((FnRelSupplier) o).relFn == relFn;
      }
  
      @Override public RelNode apply(RelOptFixture fixture) {
        return relFn.apply(RelBuilder.create(FRAMEWORK_CONFIG));
      }
  
      @Override public RelNode apply2(RelMetadataFixture metadataFixture) {
        return relFn.apply(RelBuilder.create(FRAMEWORK_CONFIG));
      }
    }
  }
  