/**
* Returns a string representation of this collation, suitably terse given that it will appear in
* plan traces. Examples: "[]", "[2]", "[0 DESC, 1]", "[0 DESC, 1 ASC NULLS LAST]".
*/
public String toString() {
Iterator<RelFieldCollation> it = fieldCollations.iterator();
if (!it.hasNext()) {
return "[]";
}
StringBuilder sb = new StringBuilder();
sb.append('[');
for (; ; ) {
RelFieldCollation e = it.next();
sb.append(e.getFieldIndex());
if (e.direction != RelFieldCollation.Direction.ASCENDING
|| e.nullDirection != RelFieldCollation.NullDirection.UNSPECIFIED) {
sb.append(' ').append(e.shortString());
}
if (!it.hasNext()) {
return sb.append(']').toString();
}
sb.append(',').append(' ');
}
}
