57faaf376 added pg_truncate(const char *path, off_t length), but "length" is ignored under WIN32 and the file is unconditionally truncated to 0.
There's no live bug, since the only caller passes 0: | src/backend/storage/smgr/md.c: ret = pg_truncate(path, 0); But I guess extension users could be unhappy under win32, so maybe a fix should be backpatched. diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c index d4a46f01583..926d000f2ea 100644 --- a/src/backend/storage/file/fd.c +++ b/src/backend/storage/file/fd.c @@ -638,7 +638,7 @@ pg_truncate(const char *path, off_t length) fd = OpenTransientFile(path, O_RDWR | PG_BINARY); if (fd >= 0) { - ret = ftruncate(fd, 0); + ret = ftruncate(fd, length); save_errno = errno; CloseTransientFile(fd); errno = save_errno;