NobiGo commented on PR #4150:
URL: https://github.com/apache/calcite/pull/4150#issuecomment-2597432203
It seems like I made a mistake. I retested the same data situation on Pg and
it will threw an exception.
The test SQL in Postgresql:
```
CREATE TABLE public.newtable (
"number" varchar NULL
);
INSERT INTO public.newtable("number") VALUES('');
INSERT INTO public.newtable("number") VALUES('1');
```
Then execute SQL:
```
SELECT sum(cast("number" as integer))
FROM public.newtable;
```
will throw exception: SQL 错误 [22P02]: ERROR: invalid input syntax for
integer: "".
So maybe @hoperunChen should just need to add the data type in CSV title
according to the comments in Jira.
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