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-rw-r--r--sql/unireg.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/sql/unireg.h b/sql/unireg.h
index b897c887c89..028cb0546d8 100644
--- a/sql/unireg.h
+++ b/sql/unireg.h
@@ -163,6 +163,13 @@ typedef struct st_ha_create_information HA_CREATE_INFO;
#define DEFAULT_KEY_CACHE_NAME "default"
+/* The length of the header part for each virtual column in the .frm file */
+#define FRM_VCOL_HEADER_SIZE 3
+
+/* Maximum length of the defining expression for a virtual columns */
+#define VIRTUAL_COLUMN_EXPRESSION_MAXLEN 255 - FRM_VCOL_HEADER_SIZE
+
+
/* Include prototypes for unireg */
#include "mysqld_error.h"