Martin Desruisseaux created SIS-423:
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             Summary: Query DataStore using scripting languages
                 Key: SIS-423
                 URL: https://issues.apache.org/jira/browse/SIS-423
             Project: Spatial Information Systems
          Issue Type: Improvement
          Components: Storage
            Reporter: Martin Desruisseaux


As of Apache SIS 1.0, the {{Feature}} instances read by a {{DataStore}} can be 
filtered by a call to {{FeatureSet.subset(Query)}}. The only {{Query}} 
implementation currently provided is 
{{org.apache.sis.internal.storage.query.SimpleQuery}} (that class may move to 
public API later if experience shows that its API is okay). We should consider 
adding another subclass, something like {{ScriptedQuery}}, for adding the 
capability to specify the query in a scripting language. The list of supported 
languages would be provided by the {{DataStore}}. This list may include {{SQL}} 
and {{CQL}}. An empty list of supported languages would mean that the {{Query}} 
argument can not be an instance of {{ScriptedQuery}}.

The {{SQLStore}} class defined in {{org.apache.sis.storage.sql}} is an obvious 
example of {{DataStore}} supporting {{ScriptedQuery}}, with SQL as the 
supported language. But we could also define a separated module using Apache 
Calcite for adding SQL support to any {{DataStore}} that do not natively 
support SQL. When this optional module is present on the classpath, SQL would 
be automatically be added to the list of supported languages for {{DataStore}}.



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