private boolean matchDelimiterTokens(Token[] tokens, int pos) {
        Token[] dt = delimiterTokens;
        if (this.state == State.PL_STMT && !subPLStack.empty()) {
            dt = innerUtils.extractDelimiterTokens(DEFAULT_SQL_DELIMITER);
        }
        int delimiterLength = dt.length;
        int tokensLength = tokens.length;
        if (pos + delimiterLength > tokensLength) {
            return false;
        }
        for (int i = 0; i < delimiterLength; i++) {
            if (!innerUtils.isTokenEquals(dt[i], tokens[pos + i])) {
                return false;
            }
        }
        return true;
    }
<pre>
`subPLStack` in this function must not be empty because this fuction must be called when state in PL_STMT
`subPLStack` must have been pushed at least once before enter PL_STMT
</pre>
chat2db-server/chat2db-spi/src/main/java/ai/chat2db/spi/util/SqlSplitter.java