Correlated Subqueries are not pushed to the Data Source query in MetaMatrix

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Issue

Queries containing correlated subqueries with a count(distinct X) are not sent to data source, instead are calculated within MetaMatrix when the data is returned.
Automated test suites containing these subqueries have performance issues.
How can we resolve this issue?

Environment

MetaMatrix Enterprise Server 5.5.x
Oracle ANSI XA Connector

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