Method shift

core/src/main/java/org/apache/calcite/rex/RexUtil.java:1950–1955

Shifts every RexInputRef in an expression by offset.

(RexNode node, final int offset)

   * Shifts every {@link RexInputRef} in an expression by {@code offset}.
   */
  public static RexNode shift(RexNode node, final int offset) {
    if (offset == 0) {
      return node;
    }
    return node.accept(new RexShiftShuttle(offset));
  }

  /**
   * Shifts every {@link RexInputRef} in an expression by {@code offset}.