Re: patch: function xmltable

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Craig Ringer <craig(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: patch: function xmltable
Date: 2016-11-18 20:49:36
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2016-11-17 19:22 GMT+01:00 Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>:

> I've been going over this patch. I think it'd be better to restructure
> the <sect2> before adding the docs for this new function; I already
> split it out, so don't do anything about this.
> Next, looking at struct TableExprBuilder I noticed that the comments are
> already obsolete, as they talk about function params that do not exist
> (missing_columns) and they fail to mention the ones that do exist.
> Also, function member SetContent is not documented at all. Overall,
> these comments do not convey a lot -- apparently, whoever reads them is
> already supposed to know how it works: "xyz sets a row generating
> filter" doesn't tell me anything. Since this is API documentation, it
> needs to be much clearer.
> ExecEvalTableExpr and ExecEvalTableExprProtected have no comments
> whatsoever. Needs fixed.

I am sending the patch with more comments - but it needs a care someone
with good English skills.

> I wonder if it'd be a good idea to install TableExpr first without the
> implementing XMLTABLE, so that it's clearer what is API and what is
> implementation.

I am not sure about this step - the API is clean from name. In this moment,
for this API is not any other tests than XMLTABLE implementation.

> The number of new keywords in this patch is depressing. I suppose
> there's no way around that -- as I understand, this is caused by the SQL
> standard's definition of the syntax for this feature.
> Have to go now for a bit -- will continue looking afterwards. Please
> submit delta patches on top of your latest v12 to fix the comments I
> mentioned.


> --
> Álvaro Herrera
> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

Attachment Content-Type Size
fix-comments.patch text/x-patch 4.1 KB

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