fix case

tests/system-test/2-query/ltrim.py

@@ -51,7 +51,7 @@ class TDTestCase:
 
         for num_col in NUM_COL:
             ltrim_condition.extend( f"cast( {num_col} + {bool_col} as binary(16) )" for bool_col in BOOLEAN_COL )
-            ltrim_condition.extend( f"cast( {num_col} + {ts_col} as binary(16) )" for ts_col in TS_TYPE_COL )
+            ltrim_condition.extend( f"cast( {num_col} + {ts_col} as binary(16) )" for ts_col in TS_TYPE_COL if num_col is not FLOAT_COL and num_col is not DOUBLE_COL)
 
         ltrim_condition.extend( f"cast( {bool_col} + {ts_col} as binary(16) )" for bool_col in BOOLEAN_COL for ts_col in TS_TYPE_COL )