Method project

core/src/main/java/org/apache/calcite/rel/RelRoot.java:156–158

Returns the root relational expression, creating a LogicalProject if necessary to remove fields that are not needed.

()

  /** Returns the root relational expression, creating a {@link LogicalProject}
   * if necessary to remove fields that are not needed. */
  public RelNode project() {
    return project(false);
  }

  /** Returns the root relational expression as a {@link LogicalProject}.
   *