paleolimbot opened a new issue, #884:
URL: https://github.com/apache/arrow-nanoarrow/issues/884
From the CRAN warnings:
```
g++-16 -std=gnu++17
-I"/home/hornik/tmp/R.check/r-devel-gcc/Work/build/include" -DNDEBUG -I../src/c
-I../src/c/include -I../src/c/vendor/
-I../src/c/vendor/portable-snippets/include/ -I../src/c/vendor/fmt/include
-I/usr/include/postgresql -DADBC_EXPORT="" -DFMT_HEADER_ONLY=1
-I/usr/local/include -D_FORTIFY_SOURCE=3 -fpic -g -O2 -Wall -pedantic
-mtune=native -c c/driver/postgresql/statement.cc -o
c/driver/postgresql/statement.o
gcc-16 -I"/home/hornik/tmp/R.check/r-devel-gcc/Work/build/include" -DNDEBUG
-I../src/c -I../src/c/include -I../src/c/vendor/
-I../src/c/vendor/portable-snippets/include/ -I../src/c/vendor/fmt/include
-I/usr/include/postgresql -DADBC_EXPORT="" -DFMT_HEADER_ONLY=1
-I/usr/local/include -D_FORTIFY_SOURCE=3 -fpic -g -O2 -Wall
-Wstrict-prototypes -pedantic -mtune=native -c c/vendor/nanoarrow/nanoarrow.c
-o c/vendor/nanoarrow/nanoarrow.o
In file included from /usr/include/stdio.h:970,
from c/vendor/nanoarrow/nanoarrow.c:21:
In function ‘snprintf’,
inlined from ‘PrivateArrowSchemaToString’ at
c/vendor/nanoarrow/nanoarrow.c:2056:20:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:68:10: warning: null destination
pointer [-Wformat-truncation=]
68 | return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
69 | __glibc_objsize (__s), __fmt,
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
70 | __va_arg_pack ());
| ~~~~~~~~~~~~~~~~~
```
I think the issue is that `ArrowSchemaToString()` can return `nullptr`, and
is sometimes used in a printf string. I think this functionally doesn't happen
because the `ArrowType` in question is provided by an `ArrowSchemaView`, whose
initializer never assigns an unknown type; however, we should still fix this.
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