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From "Martin Desruisseaux (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SIS-423) Query DataStore using scripting languages
Date Wed, 11 Jul 2018 10:14:00 GMT
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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