diff --git a/src/inc/taosdef.h b/src/inc/taosdef.h
index 15fb026381db93530834e85c0c70bc24b0debea8..b476c866d99cb8d1e5375e88864e167a19122510 100644
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -32,19 +32,8 @@ extern "C" {
 #define TSKEY int64_t
 #endif
 
-// Data type definition
-#define TSDB_DATA_TYPE_NULL       0     // 1 bytes
-#define TSDB_DATA_TYPE_BOOL       1     // 1 bytes
-#define TSDB_DATA_TYPE_TINYINT    2     // 1 byte
-#define TSDB_DATA_TYPE_SMALLINT   3     // 2 bytes
-#define TSDB_DATA_TYPE_INT        4     // 4 bytes
-#define TSDB_DATA_TYPE_BIGINT     5     // 8 bytes
-#define TSDB_DATA_TYPE_FLOAT      6     // 4 bytes
-#define TSDB_DATA_TYPE_DOUBLE     7     // 8 bytes
-#define TSDB_DATA_TYPE_BINARY     8     // string
-#define TSDB_DATA_TYPE_TIMESTAMP  9     // 8 bytes
-#define TSDB_DATA_TYPE_NCHAR      10    // unicode string
-#define TSDB_DATA_TYPE_ARRAY      11    // only used 'in' query to hold the values
+// this data type is internally used only in 'in' query to hold the values
+#define TSDB_DATA_TYPE_ARRAY      (TSDB_DATA_TYPE_NCHAR + 1)
 
 // Bytes for each type.
 extern const int32_t TYPE_BYTES[11];