On 1 Apr 2018, at 8:19am, Eric Grange <egra...@glscene.org> wrote:

> The decl_type allows to differentiate a datetime, or a "wide" text from a
> single char text column

The reason descl_type does not work on expressions is the reason I illustrated 
in my previous post: the expression can have a different type for different 
rows of the result and therefore has no affinity throughout the entire set of 
results.

You could, perhaps, check the types of the first row of results, and assume 
that all rows will have the same types.

Simon.
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