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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regarding one-pass, would the contents of the queryObj suffice?
It fully encapsulates the query (if it is indeed a query being done) and would
be accessible through the layer’s pointer back to the parent mapObj
(layer->map->query).<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Steve<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Tamas Szekeres
[mailto:szekerest@gmail.com] <br>
<b>Sent:</b> Monday, November 08, 2010 3:06 PM<br>
<b>To:</b> Lime, Steve D (DNR)<br>
<b>Cc:</b> mapserver-dev@lists.osgeo.org<br>
<b>Subject:</b> Re: [mapserver-dev] 6.0 release plan<o:p></o:p></span></p>
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<p class=MsoNormal>2010/11/8 Lime, Steve D (DNR) <<a
href="mailto:Steve.Lime@state.mn.us" target="_blank">Steve.Lime@state.mn.us</a>><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>RFC-52: The changes I’d like to see are
relatively minor (from a coding perspective) and are a return to a single
getShape() method in MapScript. It will break 5.6 scripts but is simpler in the
long run. I don’t know that an RFC is necessary but I will start a ticket and
we can go from there.</span><o:p></o:p></p>
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<p class=MsoNormal><br>
Steve,<br>
<br>
Upon thinking about the one-pass query implementation for the mssql2008 driver
I would also prefer to establish an additional parameter in msLayerWhichShapes
which would denote the purpose of the query. Actually the driver may require to
use a different fetching method if only a single-row forward only cursor is
sufficient (which may be faster) or we would require to have subsequent random
access to the result set. The latter would require to open the the query with
the block cursor option at the client side which may be less performant for
larger rowset sizes. <br>
<br>
<o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:11.0pt;color:#1F497D'> </span> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>RFC-64: Needs feedback. This may push us
back a week or two depending on feedback. I think 6.0 is the right time to
implement though given the types of proposed changes. They are not candidates
for minor releases.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
While I'm not sure about the recent implementation, I would highly support the
efforts in RFC-64 in the way as Frank suggested earlier. In this case instead
of using globals to represent the state, we could probably use the parse-param
and lex-param directives to have a 'context' data structure something like in <a
href="http://trac.osgeo.org/gdal/browser/sandbox/warmerdam/gdal-rfc28/gdal/ogr/swq_parser.y">http://trac.osgeo.org/gdal/browser/sandbox/warmerdam/gdal-rfc28/gdal/ogr/swq_parser.y</a>
used for GDAL. This would make the parser thread safe without requiring a
global lock around the operations and I would also expect a significant
increment in the overall performance when rendering maps in multithreaded
environments.<br>
<br>
<br>
Best regards,<br>
<br>
Tamas<o:p></o:p></p>
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