TD-6129<feature> add python test case

src/connector/python/taos/constants.py

@@ -25,6 +25,7 @@ class FieldType(object):
     C_SMALLINT_UNSIGNED = 12
     C_INT_UNSIGNED = 13
     C_BIGINT_UNSIGNED = 14
+    C_JSON = 15
     # NULL value definition
     # NOTE: These values should change according to C definition in tsdb.h
     C_BOOL_NULL = 0x02

src/connector/python/taos/field.py

@@ -207,6 +207,7 @@ CONVERT_FUNC = {
     FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
     FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
     FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python,
+    FieldType.C_JSON: _crow_nchar_to_python,
 }
 
 CONVERT_FUNC_BLOCK = {
@@ -224,6 +225,7 @@ CONVERT_FUNC_BLOCK = {
     FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
     FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
     FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python,
+    FieldType.C_JSON: _crow_nchar_to_python_block,
 }
 
 # Corresponding TAOS_FIELD structure in C