JSqlParser解析SQL时SUM包裹IF出错

SQL

SELECT SUM(IF(1=1,1,0)) AS `result` FROM sys_user

这种会报错的。

错误信息

Caused by: net.sf.jsqlparser.JSQLParserException: null
at net.sf.jsqlparser.parser.CCJSqlParserUtil.parseStatements(CCJSqlParserUtil.java:154)
at com.baomidou.mybatisplus.core.parser.AbstractJsqlParser.parser(AbstractJsqlParser.java:64)
... 92 common frames omitted
Caused by: net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "(" "("
at line 10, column 19.

Was expecting one of:
"&"
","
"::"
";"
"<<"
">>"
"ACTION"
"ANY"
"AS"
"BYTE"
"CASCADE"
"CAST"
"CHAR"
"COLUMN"
"COMMIT"
"CONNECT"
"DO"
"ENABLE"
"END"
"EXCEPT"
"EXTRACT"
"FIRST"
"FOLLOWING"
"FOR"
"FROM"
"GROUP"
"HAVING"
"INDEX"
"INSERT"
"INTERSECT"
"INTERVAL"
"INTO"
"ISNULL"
"KEY"
"LAST"
"MATERIALIZED"
"MINUS"
"NO"
"NULLS"
"OPEN"
"ORDER"
"OVER"
"PARTITION"
"PERCENT"
"PRECISION"
"PRIMARY"
"PRIOR"
"RANGE"
"REPLACE"
"ROW"
"ROWS"
"SEPARATOR"
"SIBLINGS"
"START"
"TABLE"
"TEMP"
"TEMPORARY"
"TRUNCATE"
"UNION"
"UNSIGNED"
"VALUE"
"VALUES"
"WHERE"
"XML"
"ZONE"
"^"
"|"

<K_DATETIMELITERAL>
<S_CHAR_LITERAL>
<S_IDENTIFIER>
<S_QUOTED_IDENTIFIER>
at net.sf.jsqlparser.parser.CCJSqlParser.generateParseException(CCJSqlParser.java:18597)
at net.sf.jsqlparser.parser.CCJSqlParser.jj_consume_token(CCJSqlParser.java:18447)
at net.sf.jsqlparser.parser.CCJSqlParser.Statements(CCJSqlParser.java:516)
at net.sf.jsqlparser.parser.CCJSqlParserUtil.parseStatements(CCJSqlParserUtil.java:152)
... 93 common frames omitted

解决办法

将IF换成case when的形式