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nexedi
MariaDB
Commits
4971d4de
Commit
4971d4de
authored
17 years ago
by
marko
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Document that DICT_MAX_INDEX_COL_LEN must not be changed.
parent
c99433a3
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dict/dict0dict.c
dict/dict0dict.c
+6
-0
include/dict0mem.h
include/dict0mem.h
+3
-1
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dict/dict0dict.c
View file @
4971d4de
...
...
@@ -1531,6 +1531,12 @@ dict_index_add_col(
if
(
field
->
fixed_len
>
DICT_MAX_INDEX_COL_LEN
)
{
field
->
fixed_len
=
0
;
}
#if DICT_MAX_INDEX_COL_LEN != 768
/* The comparison limit above must be constant. If it were
changed, the disk format of some fixed-length columns would
change, which would be a disaster. */
# error "DICT_MAX_INDEX_COL_LEN != 768"
#endif
if
(
!
(
col
->
prtype
&
DATA_NOT_NULL
))
{
index
->
n_nullable
++
;
...
...
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include/dict0mem.h
View file @
4971d4de
...
...
@@ -161,7 +161,9 @@ struct dict_col_struct{
/* DICT_MAX_INDEX_COL_LEN is measured in bytes and is the max index column
length + 1. Starting from 4.1.6, we set it to < 3 * 256, so that one can
create a column prefix index on 255 characters of a TEXT field also in the
UTF-8 charset. In that charset, a character may take at most 3 bytes. */
UTF-8 charset. In that charset, a character may take at most 3 bytes.
This constant MUST NOT BE CHANGED, or the compatibility of InnoDB data files
would be at risk! */
#define DICT_MAX_INDEX_COL_LEN 768
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