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* impl EmptyMetric plan Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * add test cases Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * impl planner part Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * adapt new datafusion changes Signed-off-by: Ruihang Xia <waynestxia@gmail.com> * fix typo Signed-off-by: Ruihang Xia <waynestxia@gmail.com> --------- Signed-off-by: Ruihang Xia <waynestxia@gmail.com>