Segfault when reading an empty Parquet file #138
Description
Working with the dev version, and it segfaults when I read an empty Parquet file. To reproduce:
tf <- tempfile()
arrow::write_parquet(data.frame(), tf)
nanoparquet::read_parquet(tf)I ran it with the debugger attached, and output is shown below.
(gdb) run
Starting program: /usr/lib/R/bin/exec/R --no-save --no-restore-data --quiet
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/x86_64-linux-gnu/libthread_db.so.1".
[Detaching after vfork from child process 10261]
[Detaching after vfork from child process 10263]
> devtools::load_all()
[New Thread 0x7ffff31ff640 (LWP 10275)]
[Detaching after vfork from child process 10281]
[Detaching after vfork from child process 10283]
[Detaching after vfork from child process 10286]
ℹ Loading nanoparquet
> library(arrow)
[New Thread 0x7fffe95ff640 (LWP 10298)]
[Detaching after vfork from child process 10299]
Attaching package: ‘arrow’
The following objects are masked from ‘package:nanoparquet’:
read_parquet, write_parquet
The following object is masked from ‘package:testthat’:
matches
The following object is masked from ‘package:utils’:
timestamp
> tf <- tempfile()
> arrow::write_parquet(data.frame(), tf)
> read_parquet(tf)
[New Thread 0x7fffe8dfe640 (LWP 10321)]
[New Thread 0x7fffe3fff640 (LWP 10322)]
data frame with 0 columns and 0 rows
> nanoparquet::read_parquet(tf)
Thread 1 "R" received signal SIGSEGV, Segmentation fault.
0x00007ffff7c3b8f5 in Rf_type2char () from /usr/lib/R/lib/libR.so