diff options
Diffstat (limited to 'storage/innobase/include/dict0mem.h')
| -rw-r--r-- | storage/innobase/include/dict0mem.h | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/storage/innobase/include/dict0mem.h b/storage/innobase/include/dict0mem.h index ff6c4ec9b28..7eec86d0bcb 100644 --- a/storage/innobase/include/dict0mem.h +++ b/storage/innobase/include/dict0mem.h @@ -152,12 +152,12 @@ struct dict_col_struct{ in some of the functions below */ }; -/* DICT_MAX_COL_PREFIX_LEN is measured in bytes. Starting from 4.1.6, we -set max col prefix len 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. */ +/* 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. */ -#define DICT_MAX_COL_PREFIX_LEN 768 +#define DICT_MAX_INDEX_COL_LEN 768 /* Data structure for a field in an index */ struct dict_field_struct{ @@ -169,12 +169,12 @@ struct dict_field_struct{ prefix in bytes in a MySQL index of type, e.g., INDEX (textcol(25)); must be smaller than - DICT_MAX_COL_PREFIX_LEN; NOTE that + DICT_MAX_INDEX_COL_LEN; NOTE that in the UTF-8 charset, MySQL sets this to 3 * the prefix len in UTF-8 chars */ ulint fixed_len; /* 0 or the fixed length of the column if smaller than - DICT_MAX_COL_PREFIX_LEN */ + DICT_MAX_INDEX_COL_LEN */ ulint fixed_offs; /* offset to the field, or ULINT_UNDEFINED if it is not fixed within the record (due to preceding |