On 2015-11-21 06:06, Tom Lane wrote:
Marko Tiikkaja <ma...@joh.to> writes:
Here's a patch implementing this under the name num_nulls().  For
January's CF, of course.

What's this do that "count(*) - count(x)" doesn't?

This is sort of a lateral version of count(x); the input is a list of expressions rather than an expression executed over a bunch of input rows.


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