diff options
Diffstat (limited to 'sql/sql_const.h')
| -rw-r--r-- | sql/sql_const.h | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/sql/sql_const.h b/sql/sql_const.h index abe2a496045..e8385b537a8 100644 --- a/sql/sql_const.h +++ b/sql/sql_const.h @@ -41,7 +41,18 @@ #define MAX_MBWIDTH 3 /* Max multibyte sequence */ #define MAX_FIELD_CHARLENGTH 255 -#define MAX_FIELD_VARCHARLENGTH 65535 +/* + In MAX_FIELD_VARCHARLENGTH we reserve extra bytes for the overhead: + - 2 bytes for the length + - 1 byte for NULL bits + to avoid the "Row size too large" error for these three corner definitions: + CREATE TABLE t1 (c VARBINARY(65533)); + CREATE TABLE t1 (c VARBINARY(65534)); + CREATE TABLE t1 (c VARBINARY(65535)); + Like VARCHAR(65536), they will be converted to BLOB automatically + in non-sctict mode. +*/ +#define MAX_FIELD_VARCHARLENGTH (65535-2-1) #define MAX_FIELD_BLOBLENGTH UINT_MAX32 /* cf field_blob::get_length() */ #define CONVERT_IF_BIGGER_TO_BLOB 512 /* Threshold *in characters* */ |