presto-google-sheets/src/main/java/io/prestosql/plugin/google/sheets/SheetsRecordCursor.java/SheetsRecordCursor/getFieldValue
class SheetsRecordCursor:    private String getFieldValue(int field)
    {
        checkState(fields != null, "Cursor has not been advanced yet");
        return fields.get(field);
    }