final ColumnNameType cnt = new ColumnNameType(exprStr, tc);
cnts.add(cnt);
}
// copying all the synonims from inputTupleSchema
final TupleSchema result = new TupleSchema(cnts);
final Map<String, String> inputSynonims = _inputTupleSchema.getSynonims();
if (inputSynonims != null)
result.setSynonims(inputSynonims);
return result;
}