If you double-alias a column in a query (yeah, stupid, I know, but I did 
it by mistake and others will too!), then the dreaded "fmgr_info: 
function <number>: cache lookup failed" message is kicked out. For example:

  select * from company c, references r where r.company_id=c.company.id;

Note that c.company.id references column id in table company twice!

Hope that this finds someone looking at the error handling in the 
parser! Should be chucked out as a syntax error.

Brad


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