[fix](Nereids) should derive stats asap to avoid npe (#34238) (#35451)

pick from master #34238

we do derive stats job eager to avoid un derive stats due to merge group and optimize group
consider:
  we have two groups burned by order: G1 and G2
  then we have job by order derive G2, optimize group expression in G2,
    derive G1, optimize group expression in G1
  if G1 merged into G2, then we maybe generated job optimize group G2 before derive G1
  in this case, we will do get stats from G1's child before derive G1's child stats
  then we will meet NPE in CostModel.

fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/cascades/ApplyRuleJob.java

@@ -33,6 +33,8 @@
 import org.apache.doris.nereids.trees.plans.Plan;
 import org.apache.doris.nereids.trees.plans.logical.LogicalPlan;
 
+import com.google.common.collect.Lists;
+
 import java.util.HashMap;
 import java.util.List;
 
@@ -67,6 +69,7 @@ public void execute() throws AnalysisException {
         }
         countJobExecutionTimesOfGroupExpressions(groupExpression);
 
+        List<DeriveStatsJob> deriveStatsJobs = Lists.newArrayList();
         GroupExpressionMatching groupExpressionMatching
                 = new GroupExpressionMatching(rule.getPattern(), groupExpression);
         for (Plan plan : groupExpressionMatching) {
@@ -86,11 +89,22 @@ public void execute() throws AnalysisException {
                     pushJob(new CostAndEnforcerJob(newGroupExpression, context));
                 }
                 // we should derive stats for new logical/physical plan if the plan missing the stats
-                pushJob(new DeriveStatsJob(newGroupExpression, context));
+                deriveStatsJobs.add(new DeriveStatsJob(newGroupExpression, context));
                 NereidsTracer.logApplyRuleEvent(rule.toString(), plan, newGroupExpression.getPlan());
                 APPLY_RULE_TRACER.log(TransformEvent.of(groupExpression, plan, newPlans, rule.getRuleType()),
                         rule::isRewrite);
             }
+            // we do derive stats job eager to avoid un derive stats due to merge group and optimize group
+            // consider:
+            //   we have two groups burned by order: G1 and G2
+            //   then we have job by order derive G2, optimize group expression in G2,
+            //     derive G1, optimize group expression in G1
+            //   if G1 merged into G2, then we maybe generated job optimize group G2 before derive G1
+            //   in this case, we will do get stats from G1's child before derive G1's child stats
+            //   then we will meet NPE in CostModel.
+            for (DeriveStatsJob deriveStatsJob : deriveStatsJobs) {
+                pushJob(deriveStatsJob);
+            }
         }
         groupExpression.setApplied(rule);
     }