TeslaCN opened a new issue, #22516:
URL: https://github.com/apache/shardingsphere/issues/22516
## Bug Report
### Which version of ShardingSphere did you use?
master - 935a8108a6e411cab79c7861fe1d7315d27f941c
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-Proxy PostgreSQL
### Expected behavior
```
psql -h 127.0.0.1 -p 5432 -Upostgres -c 'select n, 10.0 ^ n as "10^n", (10.0
^ n) * (10.0 ^ (-n)) = 1 as ok from generate_series(-20, 20) n;' [~]
n | 10^n | ok
-----+----------------------------------------+----
-20 | 0.0000000000000000 | f
-19 | 0.0000000000000000 | f
-18 | 0.0000000000000000 | f
-17 | 0.0000000000000000 | f
-16 | 0.0000000000000001 | t
-15 | 0.0000000000000010 | t
-14 | 0.0000000000000100 | t
-13 | 0.0000000000001000 | t
-12 | 0.0000000000010000 | t
-11 | 0.0000000000100000 | t
-10 | 0.0000000001000000 | t
-9 | 0.0000000010000000 | t
-8 | 0.0000000100000000 | t
-7 | 0.0000001000000000 | t
-6 | 0.0000010000000000 | t
-5 | 0.0000100000000000 | t
-4 | 0.0001000000000000 | t
-3 | 0.0010000000000000 | t
-2 | 0.0100000000000000 | t
-1 | 0.1000000000000000 | t
0 | 1.0000000000000000 | t
1 | 10.0000000000000000 | t
2 | 100.0000000000000000 | t
3 | 1000.0000000000000000 | t
4 | 10000.0000000000000000 | t
5 | 100000.0000000000000000 | t
6 | 1000000.0000000000000000 | t
7 | 10000000.0000000000000000 | t
8 | 100000000.0000000000000000 | t
9 | 1000000000.0000000000000000 | t
10 | 10000000000.0000000000000000 | t
11 | 100000000000.0000000000000000 | t
12 | 1000000000000.0000000000000000 | t
13 | 10000000000000.0000000000000000 | t
14 | 100000000000000.0000000000000000 | t
15 | 1000000000000000.0000000000000000 | t
16 | 10000000000000000.0000000000000000 | t
17 | 100000000000000000.0000000000000000 | f
18 | 1000000000000000000.0000000000000000 | f
19 | 10000000000000000000.0000000000000000 | f
20 | 100000000000000000000.0000000000000000 | f
(41 rows)
```
### Actual behavior
```
psql -h 127.0.0.1 -p 55432 -Upostgres -c 'select n, 10.0 ^ n as "10^n",
(10.0 ^ n) * (10.0 ^ (-n)) = 1 as ok from generate_series(-20, 20) n;'
[~]
Password for user postgres:
n | 10^n | ok
-----+----------------------------------------+-------
-20 | 0E-16 | false
-19 | 0E-16 | false
-18 | 0E-16 | false
-17 | 0E-16 | false
-16 | 1E-16 | true
-15 | 1.0E-15 | true
-14 | 1.00E-14 | true
-13 | 1.000E-13 | true
-12 | 1.0000E-12 | true
-11 | 1.00000E-11 | true
-10 | 1.000000E-10 | true
-9 | 1.0000000E-9 | true
-8 | 1.00000000E-8 | true
-7 | 1.000000000E-7 | true
-6 | 0.0000010000000000 | true
-5 | 0.0000100000000000 | true
-4 | 0.0001000000000000 | true
-3 | 0.0010000000000000 | true
-2 | 0.0100000000000000 | true
-1 | 0.1000000000000000 | true
0 | 1.0000000000000000 | true
1 | 10.0000000000000000 | true
2 | 100.0000000000000000 | true
3 | 1000.0000000000000000 | true
4 | 10000.0000000000000000 | true
5 | 100000.0000000000000000 | true
6 | 1000000.0000000000000000 | true
7 | 10000000.0000000000000000 | true
8 | 100000000.0000000000000000 | true
9 | 1000000000.0000000000000000 | true
10 | 10000000000.0000000000000000 | true
11 | 100000000000.0000000000000000 | true
12 | 1000000000000.0000000000000000 | true
13 | 10000000000000.0000000000000000 | true
14 | 100000000000000.0000000000000000 | true
15 | 1000000000000000.0000000000000000 | true
16 | 10000000000000000.0000000000000000 | true
17 | 100000000000000000.0000000000000000 | false
18 | 1000000000000000000.0000000000000000 | false
19 | 10000000000000000000.0000000000000000 | false
20 | 100000000000000000000.0000000000000000 | false
```
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
No rules configured.
```sql
select n, 10.0 ^ n as "10^n", (10.0 ^ n) * (10.0 ^ (-n)) = 1 as ok from
generate_series(-20, 20) n
```
### Reason analyze (If you can)
PostgreSQL
ShardingSphere-Proxy PostgreSQL
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