From 67eb7ec4080c8cbf0cb309407017b4657279615c Mon Sep 17 00:00:00 2001
From: Ganlin Zhao <ganlinzhao@hotmail.com>
Date: Thu, 11 Aug 2022 13:57:23 +0800
Subject: [PATCH] test: add interp test cases

---
 tests/system-test/2-query/interp.py | 559 ++++++++++++++++++++++++++++
 1 file changed, 559 insertions(+)
 create mode 100644 tests/system-test/2-query/interp.py

diff --git a/tests/system-test/2-query/interp.py b/tests/system-test/2-query/interp.py
new file mode 100644
index 0000000000..9348a8ca8f
--- /dev/null
+++ b/tests/system-test/2-query/interp.py
@@ -0,0 +1,559 @@
+import taos
+import sys
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+
+
+
+class TDTestCase:
+
+    def init(self, conn, logSql):
+        tdLog.debug(f"start to excute {__file__}")
+        tdSql.init(conn.cursor())
+
+    def run(self):
+        dbname = "db"
+        tbname = "tb"
+
+        tdSql.prepare()
+
+        tdLog.printNoPrefix("==========step1:create table")
+
+        tdSql.execute(
+            f'''create table if not exists {dbname}.{tbname}
+            (ts timestamp, c0 tinyint, c1 smallint, c2 int, c3 bigint, c4 double, c5 float, c6 bool, c7 varchar(10), c8 nchar(10))
+            '''
+        )
+
+        tdLog.printNoPrefix("==========step2:insert data")
+
+        tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-01 00:00:05', 5, 5, 5, 5, 5.0, 5.0, true, 'varchar', 'nchar')")
+        tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-01 00:00:10', 10, 10, 10, 10, 10.0, 10.0, true, 'varchar', 'nchar')")
+        tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-01 00:00:15', 15, 15, 15, 15, 15.0, 15.0, true, 'varchar', 'nchar')")
+
+        tdLog.printNoPrefix("==========step3:fill null")
+
+        ## {. . .}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(null)")
+        tdSql.checkRows(13)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+        tdSql.checkData(5, 0, None)
+        tdSql.checkData(6, 0, 10)
+        tdSql.checkData(7, 0, None)
+        tdSql.checkData(8, 0, None)
+        tdSql.checkData(9, 0, None)
+        tdSql.checkData(10, 0, None)
+        tdSql.checkData(11, 0, 15)
+        tdSql.checkData(12, 0, None)
+
+        ## {} ...
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:01', '2020-02-01 00:00:04') every(1s) fill(null)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+
+        ## {.}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:03', '2020-02-01 00:00:07') every(1s) fill(null)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+
+        ## .{}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:06', '2020-02-01 00:00:09') every(1s) fill(null)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+
+        ## .{.}.
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:08', '2020-02-01 00:00:12') every(1s) fill(null)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, 10)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+
+        ## ..{.}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:13', '2020-02-01 00:00:17') every(1s) fill(null)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+
+        ## ... {}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:16', '2020-02-01 00:00:19') every(1s) fill(null)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+
+        tdLog.printNoPrefix("==========step4:fill value")
+
+        ## {. . .}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(value, 1)")
+        tdSql.checkRows(13)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+        tdSql.checkData(5, 0, 1)
+        tdSql.checkData(6, 0, 10)
+        tdSql.checkData(7, 0, 1)
+        tdSql.checkData(8, 0, 1)
+        tdSql.checkData(9, 0, 1)
+        tdSql.checkData(10, 0, 1)
+        tdSql.checkData(11, 0, 15)
+        tdSql.checkData(12, 0, 1)
+
+        ## {} ...
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:01', '2020-02-01 00:00:04') every(1s) fill(value, 1)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+
+        ## {.}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:03', '2020-02-01 00:00:07') every(1s) fill(value, 1)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+
+        ## .{}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:06', '2020-02-01 00:00:09') every(1s) fill(value, 1)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+
+        ## .{.}.
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:08', '2020-02-01 00:00:12') every(1s) fill(value, 1)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 10)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+
+        ## ..{.}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:13', '2020-02-01 00:00:17') every(1s) fill(value, 1)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+
+        ## ... {}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:16', '2020-02-01 00:00:19') every(1s) fill(value, 1)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+
+        tdLog.printNoPrefix("==========step5:fill prev")
+
+        ## {. . .}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(prev)")
+        tdSql.checkRows(12)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 5)
+        tdSql.checkData(4, 0, 5)
+        tdSql.checkData(5, 0, 10)
+        tdSql.checkData(6, 0, 10)
+        tdSql.checkData(7, 0, 10)
+        tdSql.checkData(8, 0, 10)
+        tdSql.checkData(9, 0, 10)
+        tdSql.checkData(10, 0, 15)
+        tdSql.checkData(11, 0, 15)
+
+        ## {} ...
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:01', '2020-02-01 00:00:04') every(1s) fill(prev)")
+        tdSql.checkRows(0)
+
+        ## {.}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:03', '2020-02-01 00:00:07') every(1s) fill(prev)")
+        tdSql.checkRows(3)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+
+        ## .{}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:06', '2020-02-01 00:00:09') every(1s) fill(prev)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 5)
+
+        ## .{.}.
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:08', '2020-02-01 00:00:12') every(1s) fill(prev)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 10)
+        tdSql.checkData(3, 0, 10)
+        tdSql.checkData(4, 0, 10)
+
+        ## ..{.}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:13', '2020-02-01 00:00:17') every(1s) fill(prev)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 10)
+        tdSql.checkData(1, 0, 10)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, 15)
+        tdSql.checkData(4, 0, 15)
+
+        ## ... {}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:16', '2020-02-01 00:00:19') every(1s) fill(prev)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 15)
+        tdSql.checkData(1, 0, 15)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, 15)
+
+        tdLog.printNoPrefix("==========step6:fill next")
+
+        ## {. . .}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(next)")
+        tdSql.checkRows(12)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 10)
+        tdSql.checkData(3, 0, 10)
+        tdSql.checkData(4, 0, 10)
+        tdSql.checkData(5, 0, 10)
+        tdSql.checkData(6, 0, 10)
+        tdSql.checkData(7, 0, 15)
+        tdSql.checkData(8, 0, 15)
+        tdSql.checkData(9, 0, 15)
+        tdSql.checkData(10, 0, 15)
+        tdSql.checkData(11, 0, 15)
+
+        ## {} ...
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:01', '2020-02-01 00:00:04') every(1s) fill(next)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 5)
+
+        ## {.}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:03', '2020-02-01 00:00:07') every(1s) fill(next)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 10)
+        tdSql.checkData(4, 0, 10)
+
+        ## .{}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:06', '2020-02-01 00:00:09') every(1s) fill(next)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 10)
+        tdSql.checkData(1, 0, 10)
+        tdSql.checkData(2, 0, 10)
+        tdSql.checkData(3, 0, 10)
+
+        ## .{.}.
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:08', '2020-02-01 00:00:12') every(1s) fill(next)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 10)
+        tdSql.checkData(1, 0, 10)
+        tdSql.checkData(2, 0, 10)
+        tdSql.checkData(3, 0, 15)
+        tdSql.checkData(4, 0, 15)
+
+        ## ..{.}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:13', '2020-02-01 00:00:17') every(1s) fill(next)")
+        tdSql.checkRows(3)
+        tdSql.checkData(0, 0, 15)
+        tdSql.checkData(1, 0, 15)
+        tdSql.checkData(2, 0, 15)
+
+        ## ... {}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:16', '2020-02-01 00:00:19') every(1s) fill(next)")
+        tdSql.checkRows(0)
+
+
+        tdLog.printNoPrefix("==========step7:fill linear")
+
+        ## {. . .}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:04', '2020-02-01 00:00:16') every(1s) fill(linear)")
+        tdSql.checkRows(11)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 6)
+        tdSql.checkData(2, 0, 7)
+        tdSql.checkData(3, 0, 8)
+        tdSql.checkData(4, 0, 9)
+        tdSql.checkData(5, 0, 10)
+        tdSql.checkData(6, 0, 11)
+        tdSql.checkData(7, 0, 12)
+        tdSql.checkData(8, 0, 13)
+        tdSql.checkData(9, 0, 14)
+        tdSql.checkData(10, 0, 15)
+
+        ## {} ...
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:01', '2020-02-01 00:00:04') every(1s) fill(linear)")
+        tdSql.checkRows(0)
+
+        ## {.}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:03', '2020-02-01 00:00:07') every(1s) fill(linear)")
+        tdSql.checkRows(3)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 6)
+        tdSql.checkData(2, 0, 7)
+
+        ## .{}..
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:06', '2020-02-01 00:00:09') every(1s) fill(linear)")
+        tdSql.checkRows(4)
+        tdSql.checkData(0, 0, 6)
+        tdSql.checkData(1, 0, 7)
+        tdSql.checkData(2, 0, 8)
+        tdSql.checkData(3, 0, 9)
+
+        ## .{.}.
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:08', '2020-02-01 00:00:12') every(1s) fill(linear)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 8)
+        tdSql.checkData(1, 0, 9)
+        tdSql.checkData(2, 0, 10)
+        tdSql.checkData(3, 0, 11)
+        tdSql.checkData(4, 0, 12)
+
+        ## ..{.}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:13', '2020-02-01 00:00:17') every(1s) fill(linear)")
+        tdSql.checkRows(3)
+        tdSql.checkData(0, 0, 13)
+        tdSql.checkData(1, 0, 14)
+        tdSql.checkData(2, 0, 15)
+
+        ## ... {}
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:16', '2020-02-01 00:00:19') every(1s) fill(linear)")
+        tdSql.checkRows(0)
+
+
+        tdLog.printNoPrefix("==========step8:test intra block interpolation")
+        tdSql.execute(f"drop database {dbname}");
+
+        tdSql.prepare()
+
+        tdSql.execute(f"create table if not exists {dbname}.{tbname} (ts timestamp, c0 tinyint, c1 smallint, c2 int, c3 bigint, c4 double, c5 float, c6 bool, c7 varchar(10), c8 nchar(10))")
+
+        # set two data point has 10 days interval will be stored in different datablocks
+        tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-01 00:00:05', 5, 5, 5, 5, 5.0, 5.0, true, 'varchar', 'nchar')")
+        tdSql.execute(f"insert into {dbname}.{tbname} values ('2020-02-11 00:00:05', 15, 15, 15, 15, 15.0, 15.0, true, 'varchar', 'nchar')")
+
+        tdSql.execute(f"flush database {dbname}");
+
+        # test fill null
+
+        ## | {. | | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:05', '2020-02-11 00:00:05') every(1d) fill(null)")
+        tdSql.checkRows(11)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+        tdSql.checkData(5, 0, None)
+        tdSql.checkData(6, 0, None)
+        tdSql.checkData(7, 0, None)
+        tdSql.checkData(8, 0, None)
+        tdSql.checkData(9, 0, None)
+        tdSql.checkData(10, 0, 15)
+
+        ## | . | {} | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-03 00:00:05', '2020-02-07 00:00:05') every(1d) fill(null)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, None)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+
+        ## | {. | } | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-01-31 00:00:05', '2020-02-05 00:00:05') every(1d) fill(null)")
+        tdSql.checkRows(6)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+        tdSql.checkData(5, 0, None)
+
+        ## | . | { | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(null)")
+        tdSql.checkRows(6)
+        tdSql.checkData(0, 0, None)
+        tdSql.checkData(1, 0, 15)
+        tdSql.checkData(2, 0, None)
+        tdSql.checkData(3, 0, None)
+        tdSql.checkData(4, 0, None)
+        tdSql.checkData(5, 0, None)
+
+
+        # test fill value
+
+        ## | {. | | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:05', '2020-02-11 00:00:05') every(1d) fill(value, 1)")
+        tdSql.checkRows(11)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+        tdSql.checkData(5, 0, 1)
+        tdSql.checkData(6, 0, 1)
+        tdSql.checkData(7, 0, 1)
+        tdSql.checkData(8, 0, 1)
+        tdSql.checkData(9, 0, 1)
+        tdSql.checkData(10, 0, 15)
+
+        ## | . | {} | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-03 00:00:05', '2020-02-07 00:00:05') every(1d) fill(value, 1)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 1)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+
+        ## | {. | } | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-01-31 00:00:05', '2020-02-05 00:00:05') every(1d) fill(value, 1)")
+        tdSql.checkRows(6)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+        tdSql.checkData(5, 0, 1)
+
+        ## | . | { | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(value, 1)")
+        tdSql.checkRows(6)
+        tdSql.checkData(0, 0, 1)
+        tdSql.checkData(1, 0, 15)
+        tdSql.checkData(2, 0, 1)
+        tdSql.checkData(3, 0, 1)
+        tdSql.checkData(4, 0, 1)
+        tdSql.checkData(5, 0, 1)
+
+
+        # test fill prev
+
+        ## | {. | | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:05', '2020-02-11 00:00:05') every(1d) fill(prev)")
+        tdSql.checkRows(11)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 5)
+        tdSql.checkData(4, 0, 5)
+        tdSql.checkData(5, 0, 5)
+        tdSql.checkData(6, 0, 5)
+        tdSql.checkData(7, 0, 5)
+        tdSql.checkData(8, 0, 5)
+        tdSql.checkData(9, 0, 5)
+        tdSql.checkData(10, 0, 15)
+
+        ## | . | {} | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-03 00:00:05', '2020-02-07 00:00:05') every(1d) fill(prev)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 5)
+        tdSql.checkData(4, 0, 5)
+
+        ## | {. | } | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-01-31 00:00:05', '2020-02-05 00:00:05') every(1d) fill(prev)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 5)
+        tdSql.checkData(3, 0, 5)
+        tdSql.checkData(4, 0, 5)
+
+        ## | . | { | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(prev)")
+        tdSql.checkRows(6)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 15)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, 15)
+        tdSql.checkData(4, 0, 15)
+        tdSql.checkData(5, 0, 15)
+
+        # test fill next
+
+        ## | {. | | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-01 00:00:05', '2020-02-11 00:00:05') every(1d) fill(next)")
+        tdSql.checkRows(11)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 15)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, 15)
+        tdSql.checkData(4, 0, 15)
+        tdSql.checkData(5, 0, 15)
+        tdSql.checkData(6, 0, 15)
+        tdSql.checkData(7, 0, 15)
+        tdSql.checkData(8, 0, 15)
+        tdSql.checkData(9, 0, 15)
+        tdSql.checkData(10, 0, 15)
+
+        ## | . | {} | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-03 00:00:05', '2020-02-07 00:00:05') every(1d) fill(next)")
+        tdSql.checkRows(5)
+        tdSql.checkData(0, 0, 15)
+        tdSql.checkData(1, 0, 15)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, 15)
+        tdSql.checkData(4, 0, 15)
+
+        ## | {. | } | . |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-01-31 00:00:05', '2020-02-05 00:00:05') every(1d) fill(next)")
+        tdSql.checkRows(6)
+        tdSql.checkData(0, 0, 5)
+        tdSql.checkData(1, 0, 5)
+        tdSql.checkData(2, 0, 15)
+        tdSql.checkData(3, 0, 15)
+        tdSql.checkData(4, 0, 15)
+        tdSql.checkData(5, 0, 15)
+
+        ## | . | { | .} |
+        tdSql.query(f"select interp(c0) from {dbname}.{tbname} range('2020-02-10 00:00:05', '2020-02-15 00:00:05') every(1d) fill(next)")
+        tdSql.checkRows(2)
+        tdSql.checkData(0, 0, 15)
+        tdSql.checkData(1, 0, 15)
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+tdCases.addLinux(__file__, TDTestCase())
+tdCases.addWindows(__file__, TDTestCase())
-- 
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