From 2df0e0fcaf9f6ae8c996127440145b05985666bc Mon Sep 17 00:00:00 2001
From: xcharleslin <4212216+xcharleslin@users.noreply.github.com>
Date: Tue, 1 Aug 2023 10:47:34 -0700
Subject: [PATCH] [BUG] Fix incorrect sign bug for small decimals (#1204)

Co-authored-by: Xiayue Charles Lin <charles@eventualcomputing.com>
---
 src/daft-core/src/array/ops/cast.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/daft-core/src/array/ops/cast.rs b/src/daft-core/src/array/ops/cast.rs
index 4e2a5b61c8..a5d954aa8d 100644
--- a/src/daft-core/src/array/ops/cast.rs
+++ b/src/daft-core/src/array/ops/cast.rs
@@ -310,9 +310,11 @@ pub(super) fn decimal128_to_str(val: i128, _precision: u8, scale: i8) -> String
         if scale == 0 {
             format!("{}", integral)
         } else {
+            let sign = if val < 0 { "-" } else { "" };
+            let integral = integral.abs();
             let decimals = (val % modulus).abs();
             let scale = scale as usize;
-            format!("{}.{:0scale$}", integral, decimals)
+            format!("{}{}.{:0scale$}", sign, integral, decimals)
         }
     }
 }