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Bug#19960 Inconsistent results when joining InnoDB tables using partial UTF8 indexes

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Adding a multibyte-aware VARCHAR copying function, to put correct column prefix,
  taking in account number of characters (instead just limiting on number of bytes).
  For example, for a KEY(col(3)) on a UTF8 column when copying the string 'foo bar foo',
  we should put only 3 leftmost characters: 'foo'.
  9 characters were incorrectly put before this fix.
This commit is contained in:
bar@mysql.com/bar.intranet.mysql.r18.ru 2006-09-29 16:15:57 +05:00
commit 15887b602b
3 changed files with 55 additions and 1 deletions
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18
sql/field_conv.cc
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@ -428,6 +428,21 @@ static void do_varstring2(Copy_field *copy)
length);
}
static void do_varstring2_mb(Copy_field *copy)
{
int well_formed_error;
CHARSET_INFO *cs= copy->from_field->charset();
uint char_length= (copy->to_length - HA_KEY_BLOB_LENGTH) / cs->mbmaxlen;
uint from_length= uint2korr(copy->from_ptr);
const char *from_beg= copy->from_ptr + HA_KEY_BLOB_LENGTH;
uint length= cs->cset->well_formed_len(cs, from_beg, from_beg + from_length,
char_length, &well_formed_error);
int2store(copy->to_ptr, length);
memcpy(copy->to_ptr+HA_KEY_BLOB_LENGTH, from_beg, length);
}
/***************************************************************************
** The different functions that fills in a Copy_field class
***************************************************************************/
@ -587,7 +602,8 @@ void (*Copy_field::get_copy_func(Field *to,Field *from))(Copy_field*)
return do_field_string;
if (to_length != from_length)
return (((Field_varstring*) to)->length_bytes == 1 ?
do_varstring1 : do_varstring2);
do_varstring1 : (from->charset()->mbmaxlen == 1 ?
do_varstring2 : do_varstring2_mb));
}
else if (to_length < from_length)
return (from->charset()->mbmaxlen == 1 ?