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.schema;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rex.RexBuilder;
  import org.apache.calcite.rex.RexNode;
  import org.apache.calcite.util.ImmutableIntList;
  
  /**
   * A modifiable view onto {@link ModifiableTable}.
   *
   * <p>It describes how its columns map onto the underlying table's columns,
   * and any constraints that incoming rows must satisfy.
   *
   * <p>For example, given
   *
   * <blockquote><pre>
   *   CREATE TABLE emps (empno INTEGER, gender VARCHAR(1), deptno INTEGER);
   *   CREATE VIEW female_emps AS
   *     SELECT empno, deptno FROM emps WHERE gender = 'F';
   * </pre></blockquote>
   *
   * <p>constraint is {@code $1 = 'F'}
   * and column mapping is {@code [0, 2]}.
   *
   * <p>NOTE: The current API is inefficient and experimental. It will change
   * without notice.
   */
  public interface ModifiableView extends Table {
    /** Returns a constraint that each candidate row must satisfy.
     *
     * <p>Never null; if there is no constraint, returns "true".
     *
     * @param rexBuilder Rex builder
     * @param tableRowType Row type of the table that this view maps onto
     */
    RexNode getConstraint(RexBuilder rexBuilder, RelDataType tableRowType);
  
    /** Returns the column mapping onto another table.
     *
     * <p>{@code mapping[i]} contains the column of the underlying table that the
     * {@code i}th column of the view comes from, or -1 if it is based on an
     * expression.
     */
    ImmutableIntList getColumnMapping();
  
    /** Returns the underlying table. */
    Table getTable();
  
    /** Returns the full path of the underlying table. */
    Path getTablePath();
  }
  