Add native support for average and stddev aggregate functions in jdbc data
stores
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Key: GEOT-3322
URL: http://jira.codehaus.org/browse/GEOT-3322
Project: GeoTools
Issue Type: Improvement
Components: data jdbc, data jdbc-ng
Affects Versions: 2.7-M3
Reporter: Andrea Aime
Assignee: Andrea Aime
Fix For: 2.7-M4
The SQLDialect at the moment registers the following functions:
public void registerAggregateFunctions(Map<Class<? extends
FeatureVisitor>,String> aggregates) {
//register the well known
aggregates.put( CountVisitor.class, "count" );
aggregates.put( MinVisitor.class, "min");
aggregates.put( MaxVisitor.class, "max");
aggregates.put( SumVisitor.class, "sum");
}
I'm a bit suprised average and standard deviation are not there?
Afaik all databases support both "avg" and "stddev".
Is there any that does not? I'd like to add native support for those too,
eventually
allowing subclasses to restrict the list if necessary (should we ever encounter
a
database that does not support them).
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