query filter with . report syntax error

[aytrack]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table t(a decimal(55,7));
select * from t where a = 1. ;
select * from t where a between 1. and 2;

2. What did you expect to see? (Required)

all queries execute success.

3. What did you see instead (Required)

Introduced by #46314

[14:24:25]TiDB root:test> create table t(a decimal(55,7));
Query OK, 0 rows affected
Time: 0.014s
[14:24:34]TiDB root:test> select * from t where a = 1. ;
+---+
| a |
+---+
+---+
0 rows in set
Time: 0.008s
[14:24:43]TiDB root:test> select * from t where a between 1. and 2;
(1064, 'You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use line 1 column 38 near "and 2" ')

4. What is your TiDB version? (Required)

master(1769f3a)

[Defined2014]

Add some behavior related with #35031 in MySQL

select * from t where t. status = 1; -- parse ok, unreserved keyword
select * from t where t. and = 1; -- parse failed, reserverd keyword.