strongduanmu opened a new issue #11722:
URL: https://github.com/apache/shardingsphere/issues/11722
### Which version of ShardingSphere did you use?
master branch
### Which project did you use? ShardingSphere-JDBC or ShardingSphere-Proxy?
ShardingSphere-JDBC
### Expected behavior
execute select statement success
### Actual behavior
throw exception——`line 1:56 no viable alternative at input '=current_date('`
### Reason analyze (If you can)
```g4
regularFunction
: completeRegularFunction
| shorthandRegularFunction
;
shorthandRegularFunction
: CURRENT_DATE | CURRENT_TIME (LP_ NUMBER_? RP_)? | CURRENT_TIMESTAMP |
LAST_DAY | LOCALTIME | LOCALTIMESTAMP
;
completeRegularFunction
: regularFunctionName (LP_ (expr (COMMA_ expr)* | ASTERISK_)? RP_)
;
regularFunctionName
: IF | LOCALTIME | LOCALTIMESTAMP | REPLACE | INTERVAL | MOD
| DATABASE | SCHEMA | LEFT | RIGHT | DATE | DAY | GEOMETRYCOLLECTION
| LINESTRING | MULTILINESTRING | MULTIPOINT | MULTIPOLYGON | POINT |
POLYGON
| TIME | TIMESTAMP | TIMESTAMP_ADD | TIMESTAMP_DIFF | DATE |
CURRENT_TIMESTAMP | identifier
;
```
From the following g4 file, we can see that the `current_date()` function is
ambiguous. Due to the priority during parsing, the shorthandRegularFunction
rule will be used for parsing, but the shorthandRegularFunction rule cannot
parse the parentheses.
We should define a parenthesized function with the same name in the
completeRegularFunction rule to avoid parsing problems caused by priority.
### Steps to reproduce the behavior, such as: SQL to execute, sharding rule
configuration, when exception occur etc.
### Example codes for reproduce this issue (such as a github link).
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