[gdal-dev] Anyone against making OGR SQL 'SUBSTR' conformant with
other SQL implementations ?
Even Rouault
even.rouault at mines-paris.org
Thu Nov 24 16:47:04 EST 2011
Hi,
The implementation of the OGR SQL SUBSTR(string, offset[, length]) function
considers that the character offset is like the convention of the C language,
that is to say that the first character is offset 0, the second one is offset 1,
etc... All other SQL implementations I've found consider 1 as the first
character, 2 as the second one.
For details and patch, see http://trac.osgeo.org/gdal/ticket/4348
The only reason I'm reporting publicly here is that fixing that could break
existing applications/scripts. The risk seems limited however because this
function was introduced in 1.8.0 and happens not to be documented in
http://gdal.org/ogr/ogr_sql.html
So I think I'll apply the fix in trunk, and likely in 1.8 branch too. With a
notice in the backward compatibility section of the NEWS file.
Even
More information about the gdal-dev
mailing list