Various errors in bounds computation
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Key: GEOT-2704
URL: http://jira.codehaus.org/browse/GEOT-2704
Project: GeoTools
Issue Type: Bug
Components: data jdbc-ng
Affects Versions: 2.5.7
Reporter: Andrea Aime
Assignee: Andrea Aime
Fix For: 2.6-RC1
Looking into GEOT-2752 I've noticed the following bugs in the existing bounds
computing algorithm:
- the Query propertyNames are ignored. However the bounds should be only about
the features the Query extracts. If the query does not extract a geometry among
the properties, the bounds should be empty. If a table has many geometries and
the query extracts just one of them, the bounds should be relative to them
- the bounds query building code creates a select that extracts the bounds of
all geometries, but the code that aggregates them ever only accesses the first
There is also something odd about the contract with the
SqlDialect.encodeGeometryEnvelope, as it is not clear whether a single geometry
envelope is to be extracted, or if an aggregation function is to be used.
The code tha aggregates the resulting envelopes in JDBCDataStore is setup to
handle both cases. If that is to be expected the javadoc in SQLDialect should
be amended to recommend the usage of an aggregate function and allow a fall
back to a single geometry envelope extraction in case the first is not
available. Thought, honestly, this would be very expensive, in that case the
datastore api allows to just return a null to signify the computation was too
expensive to be carried out.
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