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Added MY_CS_NONASCII marker for character sets that are not compatible with latin1 for characters 0x00-0x7f

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This allows us to skip and speed up some very common character converts that MySQL is doing when sending data to the client
and this gives us a nice speed increase for most queries that uses only characters in the range 0x00-0x7f.

This code is based on Alexander Barkov's code that he has done in MySQL 6.0


include/m_ctype.h:
  Added MY_CS_NONASCII marker
libmysqld/lib_sql.cc:
  Added function net_store_data(...) that takes to and from CHARSET_INFO * as arguments
mysys/charset.c:
  Mark character sets with MY_CS_NONASCII
scripts/mysql_install_db.sh:
  Fixed messages to refer to MariaDB instead of MySQL
sql/protocol.cc:
  Added function net_store_data(...) that takes to and from CHARSET_INFO * as arguments
sql/protocol.h:
  Added function net_store_data(...) that takes to and from CHARSET_INFO * as arguments
sql/sql_string.cc:
  Quicker copy of strings with no characters above 0x7f
strings/conf_to_src.c:
  Added printing of MY_CS_NONASCII
strings/ctype-extra.c:
  Mark incompatible character sets with MY_CS_NONASCII
  Removed duplicated character set geostd
strings/ctype-sjis.c:
  Mark incompatible character sets with MY_CS_NONASCII
strings/ctype-uca.c:
  Mark incompatible character sets with MY_CS_NONASCII
strings/ctype-ucs2.c:
  Mark incompatible character sets with MY_CS_NONASCII
strings/ctype-utf8.c:
  Mark incompatible character sets with MY_CS_NONASCII
strings/ctype.c:
  Added function to check if character set is compatible with latin1 in ranges 0x00-0x7f
This commit is contained in:
Michael Widenius 2009-07-02 13:15:33 +03:00
commit 9db357e2bf
14 changed files with 240 additions and 126 deletions
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20
strings/ctype.c
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@ -405,3 +405,23 @@ my_charset_is_8bit_pure_ascii(CHARSET_INFO *cs)
}
return 1;
}
/*
Shared function between conf_to_src and mysys.
Check if a 8bit character set is compatible with
ascii on the range 0x00..0x7F.
*/
my_bool
my_charset_is_ascii_compatible(CHARSET_INFO *cs)
{
uint i;
if (!cs->tab_to_uni)
return 1;
for (i= 0; i < 128; i++)
{
if (cs->tab_to_uni[i] != i)
return 0;
}
return 1;
}