Method explainTerms

core/src/main/java/org/apache/calcite/rel/core/Sort.java:262–282

(RelWriter pw)

  }

  @Override public RelWriter explainTerms(RelWriter pw) {
    super.explainTerms(pw);
    if (pw.nest()) {
      pw.item("collation", collation);
    } else {
      for (Ord<RexNode> ord : Ord.zip(getSortExps())) {
        pw.item("sort" + ord.i, ord.e);
      }
      for (Ord<RelFieldCollation> ord
          : Ord.zip(collation.getFieldCollations())) {
        if (!pw.expand()) {
          pw.item("dir" + ord.i, ord.e.shortString());
        } else {
          pw.item("dir" + ord.i, ord.e.fullString());
        }
      }
    }
    pw.itemIf("offset", offset, offset != null);
    pw.itemIf("fetch", fetch, fetch != null);
    return pw;
  }

  /** Returns the double value of a node if it is a literal, otherwise null. */
  private static @Nullable Double doubleValue(@Nullable RexNode r) {