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Re: schema agnostic functions in language sql

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On Fri, May 15, 2020 at 4:07 PM Rob Sargent <robjsargent@xxxxxxxxx> wrote:

I'm terribly sorry:  I needed to add that plpgsql works without any
knowledge of the schema, where as defining a plain sql functions does
not work without schema qualification.

You need to distinguish between "works" as in "compiles" and "works" as in "executes".

Yes, SQL and pl/pgsql have very different behaviors when it comes to compilation and execution.  In particular SQL performs parsing earlier (during creation - just like it does for views) and links the textual query to its parse result earlier.  For pl/pgsql none of that happens until the function is called.  Because of this pl/pgsql allows for ambiguous sql text to exist and be concretely resolved during execution while SQL does not.

David J.


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