adjust the max bytes per row

src/inc/taosdef.h

@@ -197,9 +197,10 @@ do { \
 
   /**
    *  Don't change to 65536. As in some scenarios uint16_t (0~65535) is used to store the row len.
-   *  Finally, we use 65531(65535 - 4), as the SDataRow and SKVRow including 4 bits header.
+   *  So, we use 65531(65535 - 4), as the SDataRow and SKVRow including 4 bits header.
+   *  If all cols are VarType except primary key, we need 4 bits to store the offset. 65531-8-4095*4=49143
    */
-#define TSDB_MAX_BYTES_PER_ROW    65531
+#define TSDB_MAX_BYTES_PER_ROW    49143
 #define TSDB_MAX_TAGS_LEN         16384
 #define TSDB_MAX_TAGS             128
 #define TSDB_MAX_TAG_CONDITIONS   1024