diff --git a/tests/system-test/2-query/join.py b/tests/system-test/2-query/join.py
index 6e85ce4e49..af4e2b93c1 100644
--- a/tests/system-test/2-query/join.py
+++ b/tests/system-test/2-query/join.py
@@ -172,11 +172,11 @@ class TDTestCase:
             ( { now_time +  7776000000 }, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 { now_time + 5184000000}, {pow(2,31)-pow(2,15)}, {pow(2,63)-pow(2,30)}, 32767, 127,
-                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", { now_time - 86400000}
+                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", { now_time - 86400000}
                 )
             (
                 { now_time + 2592000000 }, {pow(2,31)-pow(2,16)}, {pow(2,63)-pow(2,31)}, 32766, 126,
-                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", { now_time - 172800000}
+                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", { now_time - 172800000}
                 )
             '''
         )
@@ -188,11 +188,11 @@ class TDTestCase:
             ( { now_time + 777600000 }, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 { now_time + 5184000000 }, { -1 * pow(2,31) + pow(2,15) }, { -1 * pow(2,63) + pow(2,30) }, -32766, -126,
-                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", { now_time - 86400000 }
+                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", { now_time - 86400000 }
                 )
             (
                 { now_time + 2592000000 }, { -1 * pow(2,31) + pow(2,16) }, { -1 * pow(2,63) + pow(2,31) }, -32767, -127,
-                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", { now_time - 172800000 }
+                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", { now_time - 172800000 }
                 )
             '''
         )
@@ -210,12 +210,12 @@ class TDTestCase:
             ( { now_time - rows * 3600000 }, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             ( { now_time + 7200000 }, { pow(2,31) - pow(2,15) }, { pow(2,63) - pow(2,30) }, 32767, 127,
                 { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 },
-                "binary_limit-1", "nachar_limit-1", { now_time - 86400000 }
+                "binary_limit-1", "nchar_limit-1", { now_time - 86400000 }
                 )
             (
                 { now_time + 3600000 } , { pow(2,31) - pow(2,16) }, { pow(2,63) - pow(2,31) }, 32766, 126,
                 { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 },
-                "binary_limit-2", "nachar_limit-2", { now_time - 172800000 }
+                "binary_limit-2", "nchar_limit-2", { now_time - 172800000 }
                 )
             '''
         )
diff --git a/tests/system-test/2-query/length.py b/tests/system-test/2-query/length.py
index 803cc3fcf4..2bf3f22b56 100644
--- a/tests/system-test/2-query/length.py
+++ b/tests/system-test/2-query/length.py
@@ -61,7 +61,17 @@ class TDTestCase:
             for group_condition in groups:
                 tdSql.query(f"select {condition} from {tbname} {where_condition}  {group_condition} ")
                 datas = [tdSql.getData(i,0) for i in range(tdSql.queryRows)]
-                length_data = [ len(str(data))  if data else None for data in datas ]
+                # length_data = [ len(str(data))  if data else None for data in datas ]
+                length_data = []
+                for data in datas :
+                    if not datas:
+                        length_data.append(None)
+                    elif "nchar" in length_condition or NCHAR_COL in length_condition:
+                        length_data.append(len(str(data)) * 4)
+                    else:
+                        length_data.append(len(str(data)))
+
+
                 tdSql.query(f"select length( {condition} ) from {tbname} {where_condition}  {group_condition}")
                 for i in range(len(length_data)):
                     tdSql.checkData(i, 0, length_data[i] ) if length_data[i] else tdSql.checkData(i, 0, None)
@@ -168,11 +178,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, {pow(2,31)-pow(2,15)}, {pow(2,63)-pow(2,30)}, 32767, 127,
-                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, {pow(2,31)-pow(2,16)}, {pow(2,63)-pow(2,31)}, 32766, 126,
-                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -184,11 +194,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, { -1 * pow(2,31) + pow(2,15) }, { -1 * pow(2,63) + pow(2,30) }, -32766, -126,
-                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, { -1 * pow(2,31) + pow(2,16) }, { -1 * pow(2,63) + pow(2,31) }, -32767, -127,
-                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -206,12 +216,12 @@ class TDTestCase:
             ( now()-{rows}h, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             ( now() + 2h, { pow(2,31) - pow(2,15) }, { pow(2,63) - pow(2,30) }, 32767, 127,
                 { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 },
-                "binary_limit-1", "nachar_limit-1", now()-1d
+                "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now() + 1h , { pow(2,31) - pow(2,16) }, { pow(2,63) - pow(2,31) }, 32766, 126,
                 { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 },
-                "binary_limit-2", "nachar_limit-2", now()-2d
+                "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
diff --git a/tests/system-test/2-query/lower.py b/tests/system-test/2-query/lower.py
index 010e33d738..322a7f73fd 100644
--- a/tests/system-test/2-query/lower.py
+++ b/tests/system-test/2-query/lower.py
@@ -168,11 +168,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, {pow(2,31)-pow(2,15)}, {pow(2,63)-pow(2,30)}, 32767, 127,
-                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, {pow(2,31)-pow(2,16)}, {pow(2,63)-pow(2,31)}, 32766, 126,
-                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -184,11 +184,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, { -1 * pow(2,31) + pow(2,15) }, { -1 * pow(2,63) + pow(2,30) }, -32766, -126,
-                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, { -1 * pow(2,31) + pow(2,16) }, { -1 * pow(2,63) + pow(2,31) }, -32767, -127,
-                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -206,12 +206,12 @@ class TDTestCase:
             ( now()-{rows}h, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             ( now() + 2h, { pow(2,31) - pow(2,15) }, { pow(2,63) - pow(2,30) }, 32767, 127,
                 { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 },
-                "binary_limit-1", "nachar_limit-1", now()-1d
+                "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now() + 1h , { pow(2,31) - pow(2,16) }, { pow(2,63) - pow(2,31) }, 32766, 126,
                 { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 },
-                "binary_limit-2", "nachar_limit-2", now()-2d
+                "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
diff --git a/tests/system-test/2-query/sum.py b/tests/system-test/2-query/sum.py
index 467d90ca8d..5b78550c2d 100644
--- a/tests/system-test/2-query/sum.py
+++ b/tests/system-test/2-query/sum.py
@@ -156,11 +156,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, {pow(2,31)-pow(2,15)}, {pow(2,63)-pow(2,30)}, 32767, 127,
-                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, {pow(2,31)-pow(2,16)}, {pow(2,63)-pow(2,31)}, 32766, 126,
-                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -172,11 +172,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, { -1 * pow(2,31) + pow(2,15) }, { -1 * pow(2,63) + pow(2,30) }, -32766, -126,
-                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, { -1 * pow(2,31) + pow(2,16) }, { -1 * pow(2,63) + pow(2,31) }, -32767, -127,
-                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -194,12 +194,12 @@ class TDTestCase:
             ( now()-{rows}h, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             ( now() + 2h, { pow(2,31) - pow(2,15) }, { pow(2,63) - pow(2,30) }, 32767, 127,
                 { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 },
-                "binary_limit-1", "nachar_limit-1", now()-1d
+                "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now() + 1h , { pow(2,31) - pow(2,16) }, { pow(2,63) - pow(2,31) }, 32766, 126,
                 { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 },
-                "binary_limit-2", "nachar_limit-2", now()-2d
+                "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
diff --git a/tests/system-test/2-query/upper.py b/tests/system-test/2-query/upper.py
index d2aa3c5560..e075f3a111 100644
--- a/tests/system-test/2-query/upper.py
+++ b/tests/system-test/2-query/upper.py
@@ -167,11 +167,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, {pow(2,31)-pow(2,15)}, {pow(2,63)-pow(2,30)}, 32767, 127,
-                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, {pow(2,31)-pow(2,16)}, {pow(2,63)-pow(2,31)}, 32766, 126,
-                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -183,11 +183,11 @@ class TDTestCase:
             ( now()+{rows * 9}d, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             (
                 now()+{rows * 9-10}d, { -1 * pow(2,31) + pow(2,15) }, { -1 * pow(2,63) + pow(2,30) }, -32766, -126,
-                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nachar_limit-1", now()-1d
+                { -1 * 3.2 * pow(10,38) }, { -1.2 * pow(10,308) }, { rows % 2 }, "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now()+{rows * 9-20}d, { -1 * pow(2,31) + pow(2,16) }, { -1 * pow(2,63) + pow(2,31) }, -32767, -127,
-                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nachar_limit-2", now()-2d
+                { - 3.3 * pow(10,38) }, { -1.3 * pow(10,308) }, { (rows-1) % 2 }, "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )
@@ -205,12 +205,12 @@ class TDTestCase:
             ( now()-{rows}h, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL )
             ( now() + 2h, { pow(2,31) - pow(2,15) }, { pow(2,63) - pow(2,30) }, 32767, 127,
                 { 3.3 * pow(10,38) }, { 1.3 * pow(10,308) }, { rows % 2 },
-                "binary_limit-1", "nachar_limit-1", now()-1d
+                "binary_limit-1", "nchar_limit-1", now()-1d
                 )
             (
                 now() + 1h , { pow(2,31) - pow(2,16) }, { pow(2,63) - pow(2,31) }, 32766, 126,
                 { 3.2 * pow(10,38) }, { 1.2 * pow(10,308) }, { (rows-1) % 2 },
-                "binary_limit-2", "nachar_limit-2", now()-2d
+                "binary_limit-2", "nchar_limit-2", now()-2d
                 )
             '''
         )