[fdo-internals] Sorting in SDF?

[Badreddine Karoui]

It's actually not supported by the aggregate function and if it is
enabled, then it probably would not perform. However the SDF provider
has a custom command that supports sorting on multiple properties with
different sorting parameter. This command is the SdfExtendedSelect
command. This command is designed to perform and use less memory than
the generic sorting algorithm provided in the FDO command.

Badreddine

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Pierre
Dalcourt
Sent: February 5, 2007 2:07 PM
To: FDO Internals Mail List
Subject: RE: [fdo-internals] Sorting in SDF?

Hi Jason,

Although the SDF capabilities state that ordering is not supported, it
actually is supported by SDF Provider's SelectAggregates command.
It just isn't supported by the Select command, so there was a decision
to set the capability to say its not supported.
Also, I'm not sure if there a performance issues for large sets that
need to be sorted -- your mileage may vary.

Pierre

-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Jason Birch
Sent: February 5, 2007 2:00 PM
To: FDO Internals Mail List
Subject: [fdo-internals] Sorting in SDF?

Hi,

It looks like ordering is not supported in SDF?

Any idea what it would take to add support for this?  It's pretty
important for a couple apps I'm working on where I need multi-key sorts.

Jason
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