[fix](parser) Syntax error in column with agg_state (#46829)

### What problem does this PR solve?

the problem only exists in the old optimizer

```
mysql> CREATE TABLE t (
    ->   `k1` int NULL,
    ->   `k2` agg_state<sum(int null)> GENERIC NOT NULL,
    ->   `k3` agg_state<group_concat(text null)> GENERIC NOT NULL
    -> ) ENGINE=OLAP
    -> AGGREGATE KEY(`k1`)
    -> DISTRIBUTED BY HASH(`k1`) BUCKETS 3
    -> PROPERTIES (
    -> "replication_allocation" = "tag.location.default: 1"
    -> );
ERROR 1105 (HY000): errCode = 2, detailMessage = Syntax error in line 3:
  `k2` agg_state<sum(int null)> GENERIC NOT NULL,
                 ^
Encountered: SUM
Expected: SUM is keyword, maybe `SUM`
```

fe/fe-core/src/main/cup/sql_parser.cup

@@ -6676,7 +6676,7 @@ type ::=
   {: ScalarType type = ScalarType.createHllType();
      RESULT = type;
   :}
-  | KW_AGG_STATE LESSTHAN IDENT:fnName LPAREN type_def_nullable_list:list RPAREN GREATERTHAN
+  | KW_AGG_STATE LESSTHAN ident:fnName LPAREN type_def_nullable_list:list RPAREN GREATERTHAN
   {:
     RESULT = Expr.createAggStateType(fnName,
             list.stream().map(TypeDef::getType).collect(Collectors.toList()),

regression-test/data/datatype_p0/agg_state/test_dis_nereids_agg_state.out

@@ -0,0 +1,55 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !sum --
+6
+
+-- !avg --
+2.0
+
+-- !max_by --
+2	1
+
+-- !sum_const --
+3
+
+-- !sum_null --
+\N
+
+-- !desc --
+k1	int	Yes	true	\N	
+k2	agg_state<max_by(int, int null)>	No	false	\N	GENERIC
+
+-- !length1 --
+1	11
+
+-- !group1 --
+1	1
+
+-- !merge1 --
+1
+
+-- !length2 --
+1	11
+2	11
+3	11
+4	11
+
+-- !group2 --
+1	1
+2	1
+3	2
+4	3
+
+-- !merge2 --
+3
+
+-- !union --
+3
+
+-- !max_by_null --
+\N	\N
+
+-- !ndv --
+1
+
+-- !approx_count_distinct --
+1

regression-test/suites/datatype_p0/agg_state/test_dis_nereids_agg_state.groovy

@@ -0,0 +1,81 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite("test_dis_nereids_agg_state") {
+    sql "set global enable_agg_state=true"
+    sql "set enable_nereids_planner=false"
+    sql """ DROP TABLE IF EXISTS dis_nereids_d_table; """
+    sql """
+            create table dis_nereids_d_table(
+                k1 int null,
+                k2 int not null,
+                k3 bigint null,
+                k4 varchar(100) null
+            )
+            duplicate key (k1,k2,k3)
+            distributed BY hash(k1) buckets 3
+            properties("replication_num" = "1");
+        """
+
+    sql "insert into dis_nereids_d_table select 1,1,1,'a';"
+    sql "insert into dis_nereids_d_table select 2,2,2,'b';"
+    sql "insert into dis_nereids_d_table select 3,3,null,'c';"
+
+    qt_sum """ select sum_merge(sum_state(k1)) from dis_nereids_d_table; """
+    qt_avg """ select avg_merge(avg_state(k1)) from dis_nereids_d_table; """
+    qt_max_by """ select max_by_merge(max_by_state(k1,k3)),min_by_merge(min_by_state(k1,k3)) from dis_nereids_d_table; """
+
+    qt_sum_const """ select sum_merge(sum_state(1)) from dis_nereids_d_table; """
+    qt_sum_null """ select sum_merge(sum_state(null)) from dis_nereids_d_table; """
+
+    sql """ DROP TABLE IF EXISTS dis_nereids_a_table; """
+    sql """
+            create table dis_nereids_a_table(
+                k1 int null,
+                k2 agg_state<max_by(int not null,int)> generic
+            )
+            aggregate key (k1)
+            distributed BY hash(k1) buckets 3
+            properties("replication_num" = "1");
+        """
+
+    qt_desc "desc dis_nereids_a_table;"
+
+    sql "insert into dis_nereids_a_table select 1,max_by_state(1,3);"
+    sql "insert into dis_nereids_a_table select 1,max_by_state(2,2);"
+    sql "insert into dis_nereids_a_table values(1,max_by_state(3,1));"
+
+    qt_length1 """select k1,length(k2) from dis_nereids_a_table order by k1;"""
+    qt_group1 """select k1,max_by_merge(k2) from dis_nereids_a_table group by k1 order by k1;"""
+    qt_merge1 """select max_by_merge(k2) from dis_nereids_a_table;"""
+
+    sql "insert into dis_nereids_a_table select k1+1, max_by_state(k2,k1+10) from dis_nereids_d_table;"
+
+    qt_length2 """select k1,length(k2) from dis_nereids_a_table order by k1;"""
+    qt_group2 """select k1,max_by_merge(k2) from dis_nereids_a_table group by k1 order by k1;"""
+    qt_merge2 """select max_by_merge(k2) from dis_nereids_a_table;"""
+
+    qt_union """ select max_by_merge(kstate) from (select k1,max_by_union(k2) kstate from dis_nereids_a_table group by k1 order by k1) t; """
+    qt_max_by_null """ select max_by_merge(max_by_state(k1,null)),min_by_merge(min_by_state(null,k3)) from dis_nereids_d_table; """
+
+    test {
+        sql "select avg_state(1) from dis_nereids_d_table;"
+    }
+
+    qt_ndv """select ndv_merge(t) from (select ndv_union(ndv_state(1)) as t from dis_nereids_d_table group by k1)p;"""
+    qt_approx_count_distinct """select approx_count_distinct_merge(t) from (select approx_count_distinct_union(approx_count_distinct_state(1)) as t from dis_nereids_d_table group by k1)p;"""
+}