Panic: lib-sql: Too many bind args

[dovecot at ptld.com]

> Maybe there's something wrong with my "map" configuration, which led
> to the improper syntax (see original email), but it's Dovecot that
> generated the syntax.


I have not used dictionaries and do not have first hand working 
knowledge. Until someone else more knowledgeable chimes in, this is my 
educated guess...

On the Dictionary manual page (https://wiki.dovecot.org/Dictionary) it 
talks about using fields{}, or not, having different requirements and 
syntax. It looks like you are mixing the two which might be leading to 
the issue.

If you are using fields{} it looks like you shouldn't have 
username_field defined. It also says that value_field should be "dummy" 
which i don't understand how that works. The fields{} is for using 
multiple primary key columns. If you are using only one column 
(attr_name) then maybe you should try doing the non fields{} example.

If you have not looked at this manual page before it might give you more 
hints on trouble shooting.