* @brief Plan a `BoundTableRef` * * - For a BaseTableRef, this function will return a `SeqScanPlanNode`. Note that all tables with * names beginning with `__` will be planned as `MockScanPlanNode`. * - For a `JoinRef` or `CrossProductRef`, this function will return a `NestedLoopJoinNode`. * @param table_ref the bound table ref from binder. * @return the plan node of this bound table ref.
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