On Wed, Aug 5, 2015 at 8:35 AM, John McKown <john.archie.mckown@xxxxxxxxx> wrote:
-- Looks correct to me. As I understand it the ::jsonb is NOT an operator! It is a syntactic construct for a CAST(). An equivalent which might make more sense is:select CASE WHEN CAST('{"a":null}' AS JSONB)->>'a' IS NULL THEN 'yes' ELSE 'no' END;Oh, an CAST() may look like a function call, but it is also a syntactic element. I.e. there is not a function called "CAST".
Well, I messed that up a bit. CAST is not a "syntactic element" as I was thinking. But it's not really a function call either but is closer to a function call than an operator in nature (I my ignorant opinion) . I was thinking it was a "compile time" operation, but it, like a function call, is a run-time operation. I think that using the CASE() makes it plainer that it is _not_ an operation like ->> or - and makes the precedence issue plainer.
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John McKown
10 to the 12th power microphones = 1 Megaphone
Maranatha! <><
John McKown
