Method accept

core/src/main/java/org/apache/calcite/rel/core/Sort.java:218–231

(RexShuttle shuttle)

  }

  @Override public RelNode accept(RexShuttle shuttle) {
    RexNode offset = shuttle.apply(this.offset);
    RexNode fetch = shuttle.apply(this.fetch);
    List<RexNode> originalSortExps = getSortExps();
    List<RexNode> sortExps = shuttle.apply(originalSortExps);
    assert sortExps == originalSortExps
        : "Sort node does not support modification of input field expressions."
          + " Old expressions: " + originalSortExps + ", new ones: " + sortExps;
    if (offset == this.offset
        && fetch == this.fetch) {
      return this;
    }
    return copy(traitSet, getInput(), collation, offset, fetch);
  }

  @Override public boolean isEnforcer() {
    return offset == null && fetch == null