@Override
    protected InLongMsgHead parseHead(String attr) throws Exception {
        return InLongMsgTlogKvUtils.parseHead(attr);
    }
Quote character. Null if quoting is disabled.
inlong-sort/sort-formats/format-row/format-inlongmsg-tlogkv/src/main/java/org/apache/inlong/sort/formats/inlongmsgtlogkv/InLongMsgTlogKvMixedFormatDeserializer.java