public RelOptPlanWriter explainTerms(RelOptPlanWriter pw) {
super.explainTerms(pw);
assert fieldExps.length == collations.size();
for (Ord<RexNode> ord : Ord.zip(fieldExps)) {
pw.item("sort" + ord.i, ord.e);
}
for (Ord<RelFieldCollation> ord : Ord.zip(collations)) {
pw.item("dir" + ord.i, ord.e.shortString());
}
return pw;
}
// implement RelNode
public void explain(RelOptPlanWriter pw) {
// A little adapter just to get the tuples to come out
// with curly brackets instead of square brackets. Plus
// more whitespace for readability.
List<String> renderList = new ArrayList<String>();
for (List<RexLiteral> tuple : tuples) {
String s = tuple.toString();
assert (s.startsWith("["));
assert (s.endsWith("]"));
renderList.add("{ " + s.substring(1, s.length() - 1) + " }");
}
if (pw.getDetailLevel() == SqlExplainLevel.DIGEST_ATTRIBUTES) {
// For rel digest, include the row type since a rendered
// literal may leave the type ambiguous (e.g. "null").
pw.explain(this, new String[] {"type", "tuples"}, new Object[] {rowType, renderList});
} else {
// For normal EXPLAIN PLAN, omit the type.
pw.explain(this, new String[] {"tuples"}, new Object[] {renderList});
}
}