alamb commented on pull request #9596:
URL: https://github.com/apache/arrow/pull/9596#issuecomment-788171536
I just tried a quick test on postgres which I think says postgres doesn't
upcast integer types
```
alamb=# create table foo (x smallint);
CREATE TABLE
alamb=# create table bar as select x * x from foo;
SELECT 0
alamb=# \d bar
Table "public.bar"
Column | Type | Collation | Nullable | Default
----------+----------+-----------+----------+---------
?column? | smallint | | |
alamb=#
```
If a calculation overflows the maximum value of a `smallint`, postgres
produces a runtime error rather than automatically upcasing:
```
alamb=# insert into foo values (32767);
INSERT 0 1
alamb=# select x + x from foo;
ERROR: smallint out of range
alamb=#
```
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