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btr0cur.c:

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Fix a major bug in InnoDB query estimator for queries of type SELECT ... WHERE col < x and SELECT ... WHERE col > x; MySQL could pick a table scan though the result set was only a few rows in a big table
This commit is contained in:
heikki@hundin.mysql.fi 2003-01-28 01:04:48 +02:00
parent 493e391182
commit c79a53714d
1 changed files with 8 additions and 4 deletions
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12
innobase/btr/btr0cur.c
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@ -604,11 +604,11 @@ btr_cur_open_at_index_side(
page_cur_set_after_last(page, page_cursor);
}
if (estimate) {
btr_cur_add_path_info(cursor, height, root_height);
}
if (height == 0) {
if (estimate) {
btr_cur_add_path_info(cursor, height,
root_height);
}
break;
}
@ -621,6 +621,10 @@ btr_cur_open_at_index_side(
page_cur_move_to_prev(page_cursor);
}
if (estimate) {
btr_cur_add_path_info(cursor, height, root_height);
}
height--;
node_ptr = page_cur_get_rec(page_cursor);