[opt](nereids)expr normalize after filter pushdown (#28743)

normalize expression after filter push down

fe/fe-core/src/main/java/org/apache/doris/nereids/jobs/executor/Rewriter.java

@@ -222,6 +222,8 @@ public class Rewriter extends AbstractBatchJobExecutor {
                     // but top-down traverse can not cover this case in one iteration, so bottom-up is more
                     // efficient because it can find the new plans and apply transform wherever it is
                     bottomUp(RuleSet.PUSH_DOWN_FILTERS),
+                    //after push down, some new filters are generated, which needs to be optimized. (example: tpch q19)
+                    topDown(new ExpressionOptimization()),
                     topDown(
                             new MergeFilters(),
                             new ReorderJoin(),