mirror/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-01-18 21:12:26 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

InnoDB: Optimize [and clarify] a condition in build_template()

Browse source
This commit is contained in:
marko@hundin.mysql.fi 2005-07-01 13:20:16 +03:00
parent d115c0d629
commit 4eba989290
1 changed files with 32 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
sql/ha_innodb.cc
View file

@ -2955,21 +2955,44 @@ build_template(
templ = prebuilt->mysql_template + n_requested_fields;
field = table->field[i];
ibool index_contains_field=
dict_index_contains_col_or_prefix(index, i);
if (UNIV_LIKELY(templ_type == ROW_MYSQL_REC_FIELDS)) {
/* Decide which columns we should fetch
and which we can skip. */
register const ibool index_contains_field =
dict_index_contains_col_or_prefix(index, i);
if (templ_type == ROW_MYSQL_REC_FIELDS &&
((prebuilt->read_just_key && !index_contains_field) ||
(!(fetch_all_in_key && index_contains_field) &&
!(fetch_primary_key_cols &&
dict_table_col_in_clustered_key(index->table, i)) &&
thd->query_id != field->query_id))) {
if (!index_contains_field && prebuilt->read_just_key) {
/* If this is a 'key read', we do not need
columns that are not in the key */
goto skip_field;
}
if (index_contains_field && fetch_all_in_key) {
/* This field is needed in the query */
goto include_field;
}
if (thd->query_id == field->query_id) {
/* This field is needed in the query */
goto include_field;
}
if (fetch_primary_key_cols
&& dict_table_col_in_clustered_key(index->table,
i)) {
/* This field is needed in the query */
goto include_field;
}
/* This field is not needed in the query, skip it */
goto skip_field;
}
include_field:
n_requested_fields++;
templ->col_no = i;