Re: patch: function xmltable

2016-12-18 16:27 GMT+01:00 Pavel Stehule <pavel.stehule@gmail.com>:

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> 2016-12-07 20:37 GMT+01:00 Pavel Stehule <pavel.stehule@gmail.com>:
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>> 2016-12-07 18:34 GMT+01:00 Alvaro Herrera <alvherre@2ndquadrant.com>:
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>>> Pavel Stehule wrote:
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>>> > I fixed two issues.
>>> >
>>> > 2. there was reverse setting in NOT NULL flag
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>>> Ah-hah, that was silly, thanks.
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>>> > 1. there are not columns data when there are not any explicit column -
>>> fixed
>>>
>>> Hmm.  Now that I see how this works, by having the GetValue "guess" what
>>> is going on and have a special case for it, I actually don't like it
>>> very much.  It seems way too magical.  I think we should do away with
>>> the "if column is NULL" case in GetValue, and instead inject a column
>>> during transformTableExpr if columns is NIL.  This has implications on
>>> ExecInitExpr too, which currently checks for an empty column list -- it
>>> would no longer have to do so.
>>>
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>> I prefer this way against second described. The implementation should be
>> in table builder routines, not in executor.
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>> sending new update
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> new update - no functional changes, just unbreaking after last changes in
> master.
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another update - lot of cleaning

Regards

Pavel


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> Regards
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> Pavel
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>> Regards
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>> Pavel
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>>>
>>> Maybe this means we need an additional method, which would request "the
>>> expr that returns the whole row", so that transformExpr can work for
>>> XmlTable (which I think would be something like "./") and the future
>>> JsonTable stuff (I don't know how that one would work, but I assume it's
>>> not necessarily the same thing).
>>>
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>>>
>>> --
>>> Álvaro Herrera                https://www.2ndQuadrant.com/
>>> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
>>>
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