Support estimated extents in postgis-ng
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Key: GEOT-2572
URL: http://jira.codehaus.org/browse/GEOT-2572
Project: GeoTools
Issue Type: Bug
Components: data jdbc-ng
Reporter: Andrea Aime
The current postgis datastore allows usage of the estimated extents function to
quickly compute bounds of multi-million row datasets quickly by fast inspection
of the index optimizer statistics.
The NG one does not, and in order to support it, we'll need to make some API
changes as the estimated extent is not a query that is applied on a table, but
look like:
{code:sql}
select estimated_extent('tableName', 'columnName')
{code}
The oracle plugin needs this to use the SDO_TUNE fast bbox computations as
well, but with a twist, in that case the function always returns a correct
result provided the data is in a projected CS (so it's always a good choice
with the right data set, it's not a matter of user setup).
In both cases it seems the dialect class should be modified to allow the
specific dialect to completely take over the computation of extents for a given
set of geometries.
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