add test cases

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

@@ -551,6 +551,34 @@ class TDTestCase:
         tdSql.checkData(0, 0, 15)
         tdSql.checkData(1, 0, 15)
 
+        tdLog.printNoPrefix("==========step9:test error cases")
+
+        tdSql.query(f"select interp(c0) from tb where ts >= '2020-02-10 00:00:05' and ts <= '2020-02-15 00:00:05' range('2022-02-05 00:05:00', '2022-02-06 00:05:00') every(1d) fill(null)");
+        tdSql.checkRows(2)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+
+        tdSql.error(f"select interp(c0) from {dbname}.{tbname}")
+        tdSql.error(f"select interp(c0) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05')")
+        tdSql.error(f"select interp(c0) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d)")
+        tdSql.error(f"select interp(c0) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') fill(null)")
+        tdSql.error(f"select interp(c0) from {dbname}.{tbname} every(1s) fill(null)")
+        tdSql.error(f"select interp(c0) from {dbname}.{tbname} where ts >= '2020-02-10 00:00:05' and ts <= '2020-02-15 00:00:05' every(1s) fill(null)")
+
+        # input can only be numerical types
+        tdSql.error(f"select interp(ts) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp(c6) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp(c7) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp(c8) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+
+        # input can only be columns
+        tdSql.error(f"select interp(1) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp(1.5) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp(true) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp(false) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp('abcd') from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.error(f"select interp('中文字符') from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+
     def stop(self):
         tdSql.close()
         tdLog.success(f"{__file__} successfully executed")