jackwener commented on PR #3771:
URL:
https://github.com/apache/arrow-datafusion/pull/3771#issuecomment-1272499097
PG will deduce the type of null based on other parameters.
we can specify the null type, it will ok.
```sql
jackwener=# select -null::int;
?column?
----------
(1 row)
```
deduce the type of null based on other parameters.
```sql
jackwener=# select 1+null;
?column?
----------
(1 row)
```
error, can't deduce
```sql
=# select null+null;
ERROR: operator is not unique: unknown + unknown
LINE 1: select null+null;
^
HINT: Could not choose a best candidate operator. You might need to add
explicit type casts.
leiysky=#
```
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