Hi there- I've attached a small patch exposing HS_COUNT to the user as "hstore_length(hstore)". Documentation, upgrade sql files, and a few tests are also included.
Almost every hstore function calls HS_COUNT, but I couldn't determine if there was a reason this exposure didn't already exist. Without this function, I've been converting an hstore into an array and then counting it - a more expensive operation (~30-40% slower than SELECTing the hstore itself in a few of my tests). I will add this thread and patch to the next Commitfest. Thanks, Korbin Hoffman
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