From 1f0bdab88d91ae1d87dacf9636c8c38e53f830a2 Mon Sep 17 00:00:00 2001
From: roberto <a.robertofischer@gmail.com>
Date: Sun, 1 May 2022 05:00:06 +0200
Subject: [PATCH] MOD unnecessary negations

---
 src/io/ndjson/read/file.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/io/ndjson/read/file.rs b/src/io/ndjson/read/file.rs
index cfb49bf6bc8..17595c171a4 100644
--- a/src/io/ndjson/read/file.rs
+++ b/src/io/ndjson/read/file.rs
@@ -104,7 +104,7 @@ pub fn infer<R: std::io::BufRead>(
     reader: &mut R,
     number_of_rows: Option<usize>,
 ) -> Result<DataType> {
-    if !reader.fill_buf().map(|b| !b.is_empty())? {
+    if reader.fill_buf().map(|b| b.is_empty())? {
         return Err(ArrowError::ExternalFormat(
             "Cannot infer NDJSON types on empty reader because empty string is not a valid JSON value".to_string(),
         ));