Fixed #28915 -- Prevented SQLite from truncating trailing zeros in the fractional part of DecimalField.

This reverts commit a146b65628e702a9a3ed5be21542ca45366fbb29 and adds
a test for the regression.

1 files changed, 3 insertions, 6 deletions

diff --git a/django/db/backends/sqlite3/operations.py b/django/db/backends/sqlite3/operations.py
index e90cc052d0..a267d75ea4 100644
--- a/django/db/backends/sqlite3/operations.py
+++ b/django/db/backends/sqlite3/operations.py
@@ -1,12 +1,12 @@
 import datetime
 import uuid
+from decimal import Decimal
 
 from django.conf import settings
 from django.core.exceptions import FieldError
 from django.db import utils
 from django.db.backends.base.operations import BaseDatabaseOperations
 from django.db.models import aggregates, fields
-from django.db.models.expressions import Col
 from django.utils import timezone
 from django.utils.dateparse import parse_date, parse_datetime, parse_time
 from django.utils.duration import duration_string
@@ -208,9 +208,7 @@ class DatabaseOperations(BaseDatabaseOperations):
             converters.append(self.convert_datefield_value)
         elif internal_type == 'TimeField':
             converters.append(self.convert_timefield_value)
-        # Converter for Col is added with Database.register_converter()
-        # in base.py.
-        elif internal_type == 'DecimalField' and not isinstance(expression, Col):
+        elif internal_type == 'DecimalField':
             converters.append(self.convert_decimalfield_value)
         elif internal_type == 'UUIDField':
             converters.append(self.convert_uuidfield_value)
@@ -241,8 +239,7 @@ class DatabaseOperations(BaseDatabaseOperations):
     def convert_decimalfield_value(self, value, expression, connection):
         if value is not None:
             value = expression.output_field.format_number(value)
-            # Value is not converted to Decimal here as it will be converted
-            # later in BaseExpression.convert_value().
+            value = Decimal(value)
         return value
 
     def convert_uuidfield_value(self, value, expression, connection):