mStream.print("(");
TupleSchema ts = (TupleSchema)schema;
int sz = ts.numFields();
for (int j = 0; j < sz; j++) {
if (j != 0) mStream.print(", ");
Schema s = ts.schemaFor(j);
if (s == null) mStream.print("$" + j);
else printSchema(s, j);
}
mStream.print(")");
} else {