public static SQLSelect parse(String sql, String dbType) {
    List<SQLStatement> stmtList = com.alibaba.druid.sql.SQLUtils.parseStatements(sql, dbType);

    if (stmtList.size() != 1) {
        throw new IllegalArgumentException("sql not support count : " + sql);
    }

    SQLStatement stmt = stmtList.get(0);

    if (!(stmt instanceof SQLSelectStatement)) {
        throw new IllegalArgumentException("sql not support count : " + sql);
    }

    SQLSelectStatement selectStmt = (SQLSelectStatement) stmt;
    return selectStmt.getSelect();
}

源码中lexer解析了select 后 直接找到了{，并且进了如CALL的逻辑

if (lexer.token == Token.LBRACE || lexer.identifierEquals("CALL")) {
SQLCallStatement stmt = parseCall();
statementList.add(stmt);
continue;
}

在parseCall 里会进入这个逻辑
protected void acceptIdentifier(String text) {
if (lexer.identifierEquals(text)) {
lexer.nextToken();
} else {
setErrorEndPos(lexer.pos());
throw new ParserException("syntax error, expect " + text + ", actual " + lexer.token + ", " + lexer.info());
}
}
感觉lexer解析变量有问题