code: def bottom_up_rewrite(self, root_grp_id, opt_cxt):
      grp_expr = opt_cxt.memo.groups[root_grp_id].logical_exprs[0]
      opt_cxt.task_stack.push(
          BottomUpRewrite(
              grp_expr, RulesManager().stage_two_rewrite_rules, opt_cxt
          )
      )
      self.execute_task_stack(opt_cxt.task_stack)
      return opt_cxt, root_grp_id
  
imports: import unittest
  from unittest.mock import patch
  from mock import MagicMock
  from evadb.optimizer.cost_model import CostModel
  from evadb.optimizer.operators import LogicalFilter, LogicalGet, LogicalProject, LogicalQueryDerivedGet
  from evadb.optimizer.optimizer_context import OptimizerContext
  from evadb.optimizer.optimizer_tasks import BottomUpRewrite, OptimizeGroup, OptimizerTask, TopDownRewrite
  from evadb.optimizer.property import PropertyType
  from evadb.optimizer.rules.rules_manager import RulesManager
  from evadb.plan_nodes.predicate_plan import PredicatePlan
  from evadb.plan_nodes.project_plan import ProjectPlan
  from evadb.plan_nodes.seq_scan_plan import SeqScanPlan
label_desc: Use image node_id 4 for calling the TestOptimizerTask obj's underlying member method code with example usage: obj.bottom_up_rewrite(root_grp_id, opt_cxt) and returns: opt_cxt,  root_grp_id