[postgis-devel] [PostGIS] #407: Use PgSQL globals to define number of output digits to print

[PostGIS]

#407: Use PgSQL globals to define number of output digits to print
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 Reporter:  pramsey      |       Owner:  pramsey      
     Type:  enhancement  |      Status:  new          
 Priority:  medium       |   Milestone:  PostGIS 2.0.0
Component:  postgis      |     Version:  trunk        
 Keywords:               |  
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Comment(by pramsey):

 As an aside, see #584 for a potential benefit of this feature. We should
 set extra_float_digits to -2 or -4 at the start of the regression run to
 try and squeeze out precision difference noise from the regression test
 runs.

 We can't remove the precision parameter from the function signatures in
 liblwgeom, unfortunately, since we don't have access to the GUC at that
 level, only at the database level. If we were willing to put the output
 precision into a liblwgeom global we could, but then liblwgeom would not
 be thread-safe.

 Do we care? maybe, if we plan on multi-threading it some day. On the other
 hand, the parser is currently not re-entrant, and I don't actually plan on
 making the new one re-entrant since it involves learning even more about
 bison and lex!

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Ticket URL: <http://trac.osgeo.org/postgis/ticket/407#comment:2>
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