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Re: Add json_typeof() and json_is_*() functions. - Mailing list pgsql-hackers

From Andrew Tipton
Subject Re: Add json_typeof() and json_is_*() functions.
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Msg-id CA+M2pVWjFYAtCpGSae3yJE7T+N6v288bSd=LoWXkvTLbCiNMWg@mail.gmail.com
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In response to Re: Add json_typeof() and json_is_*() functions.  (Robert Haas <robertmhaas@gmail.com>)
Responses Re: Add json_typeof() and json_is_*() functions.
Re: Add json_typeof() and json_is_*() functions.
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On Fri, Aug 2, 2013 at 8:12 PM, Robert Haas <robertmhaas@gmail.com> wrote:
+1, but I'm wondering why we need anything more than just
json_typeof().  Doesn't that pretty much cover it?

I agree with Merlin that json_is_object() is superfluous, since it can just be replaced with json_typeof() = 'object'.  Likewise for json_is_array().  But without json_is_scalar(), the choice is one of these two forms:
  json_typeof() NOT IN ('object', 'array')
  json_typeof() IN ('string', 'number', 'boolean', 'null')

And it protects the user against forgetting about, say, the 'null' typeof() when constructing their check expression.


Regards,
Andrew Tipton

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