Skipping materialization due to large Join-Union size during substitutions

I have sql Query with 4-5 join query with Dataset already created and reflected ,but when i am querying dremio triying error with Skipping materialization e6fd8c59-02f3-41cf-8837-8d12951f400b due to large Join-Union size during substitutions,and also status looks frogen stil running from 1 hour .is any steps need to follow for Joins multiple table with relection enable so that its accelerated .
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@Vikash_Singh What happens if you create a VDS with fewer joins and then create the reflection on top of it, then fire a query on this new VDS, does it use reflection?