fix: mssql table schema query

Author: Ryuk-me

dcs_core/integrations/databases/mssql.py

@@ -173,8 +173,11 @@ def query_get_table_columns(
         """
         schema = schema or self.schema_name
         database = self.quote_database(self.database)
-        query = f"SELECT column_name, data_type, datetime_precision, numeric_precision, numeric_scale, collation_name, character_maximum_length FROM {database}.information_schema.columns WHERE table_name = '{table}' AND table_schema = '{schema}'"
-
+        query = (
+            "SELECT column_name, data_type, ISNULL(datetime_precision, 0) AS datetime_precision, ISNULL(numeric_precision, 0) AS numeric_precision, ISNULL(numeric_scale, 0) AS numeric_scale, collation_name, ISNULL(character_maximum_length, 0) AS character_maximum_length "
+            f"FROM {database}.information_schema.columns"
+            f"WHERE table_name = '{table}' AND table_schema = '{schema}'"
+        )
         rows = self.fetchall(query)
         if not rows:
             raise RuntimeError(