Hmm - replying to my own post.
I did cut one corner, in that I did not implement tiny->int8 and tiny->non integers yet. That is, however, an implementation detail rather than a principal problem. If that is the whole problem, I'll add those as well. I would rather, before doing the extra work, hear that this is indeed all that is needed to get it in.
Replying to my own post again!
The documentation for SQL Server says this (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tsqlref/ts_ia-iz_3ss4.asp):
Functions will return *bigint* only if the parameter expression is a *bigint* data type. SQL Server will not automatically promote other integer data types (*tinyint*, *smallint*, and *int*) to *bigint*.Perhaps Postgres is not alone with it's casting problems.
-- Shachar Shemesh Lingnu Open Systems Consulting http://www.lingnu.com/
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