Okay, I missed the part where you did get a different plan when you set optimizer_features_enable at the session level - yes, it sounds like you're right that it's ignoring the parameter ________________________________ Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.