From 288dc518764a36bfbf5c0f0ab9ad76f2405debcf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Wed, 4 Feb 2015 23:19:45 +0100
Subject: [PATCH] SQL SIGN must return zero for zero

The SQLite implementation of SIGN is not correct for zero, it must return zero
instead of 1.

issue4518
review10831002
---
 trytond/backend/sqlite/database.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/trytond/backend/sqlite/database.py b/trytond/backend/sqlite/database.py
index 6d1c5a108d..83006faeeb 100644
--- a/trytond/backend/sqlite/database.py
+++ b/trytond/backend/sqlite/database.py
@@ -8,7 +8,6 @@ import datetime
 import time
 import sys
 import threading
-import math
 
 _FIX_ROWCOUNT = False
 try:
@@ -140,7 +139,12 @@ class SQLiteCharLength(Function):
 
 
 def sign(value):
-    return math.copysign(1, value)
+    if value > 0:
+        return 1
+    elif value < 0:
+        return -1
+    else:
+        return value
 
 
 MAPPING = {