MDEV-22660 System versioning cleanups

- Cleaned up Vers_parse_info::check_sys_fields();
- Renamed VERS_SYS_START_FLAG, VERS_SYS_END_FLAG to VERS_ROW_START,
  VERS_ROW_END.

1 files changed, 3 insertions, 3 deletions

diff --git a/include/mysql_com.h b/include/mysql_com.h
index b1534b1d746..234b6133676 100644
--- a/include/mysql_com.h
+++ b/include/mysql_com.h
@@ -193,13 +193,13 @@ enum enum_indicator_type
 #define FIELD_FLAGS_COLUMN_FORMAT_MASK (3U << FIELD_FLAGS_COLUMN_FORMAT)
 #define FIELD_IS_DROPPED (1U << 26)     /* Intern: Field is being dropped */
 
-#define VERS_SYS_START_FLAG (1 << 27)   /* autogenerated column declared with
+#define VERS_ROW_START (1 << 27)   /* autogenerated column declared with
                                              `generated always as row start`
                                               (see II.a SQL Standard) */
-#define VERS_SYS_END_FLAG (1 << 28)     /* autogenerated column declared with
+#define VERS_ROW_END (1 << 28)     /* autogenerated column declared with
                                            `generated always as row end`
                                             (see II.a SQL Standard).*/
-#define VERS_SYSTEM_FIELD (VERS_SYS_START_FLAG | VERS_SYS_END_FLAG)
+#define VERS_SYSTEM_FIELD (VERS_ROW_START | VERS_ROW_END)
 #define VERS_UPDATE_UNVERSIONED_FLAG (1 << 29) /* column that doesn't support
                                                 system versioning when table
                                                 itself supports it*/