[squid-users] incomplete Request URL field in access.log

The correct Request URL in my apache's access.log is like
http://xx.xx.xx.xx/pub/disp/Column?columnID=
http://xx.xx.xx.xx/pub/disp/Article?ArticleID=
But my Squid which cache the apache just log
http://xx.xx.xx.xx/pub/disp/Column?
http://xx.xx.xx.xx/pub/disp/Article?
And I find the following source code in src/access_log.c

/*
* We escape: \x00-\x1F"#%;<>?{}|\\\\^~`\[\]\x7F-\xFF
* which is the default escape list for the CPAN Perl5 URI module
* modulo the inclusion of space (x40) to make the raw logs a bit
* more readable.
*/
....
if (c <= 0x1F
|| c >= 0x7F
#if OLD_LOG_MIME
|| c == '"'
|| c == '#'
|| c == '%'
|| c == ';'
|| c == '<'
|| c == '>'
|| c == '?'
|| c == '{'
|| c == '}'
|| c == '|'
|| c == '\'
|| c == '^'
|| c == '~'
|| c == '`'
#endif
|| c == '['
|| c == ']') {
....

How can I disable the "?" from escape LIST?
or any other way can solve the incomplete log?
the squid version is squid-2.5.STABLE3.

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