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Bitmap post-review fixes

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2003-10-30 19:17:57 +01:00
parent a8b7edda51
commit 372e949242
10 changed files with 88 additions and 66 deletions
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36
sql/opt_range.cc
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@ -567,19 +567,29 @@ SEL_ARG *SEL_ARG::clone_tree()
return root;
}
/*****************************************************************************
** Test if a key can be used in different ranges
** Returns:
** -1 if impossible select
** 0 if can't use quick_select
** 1 if found usable range
** Updates the following in the select parameter:
** needed_reg ; Bits for keys with may be used if all prev regs are read
** quick ; Parameter to use when reading records.
** In the table struct the following information is updated:
** quick_keys ; Which keys can be used
** quick_rows ; How many rows the key matches
*****************************************************************************/
/*
Test if a key can be used in different ranges
SYNOPSIS
SQL_SELECT::test_quick_select(thd,keys_to_use, prev_tables,
limit, force_quick_range)
Updates the following in the select parameter:
needed_reg - Bits for keys with may be used if all prev regs are read
quick - Parameter to use when reading records.
In the table struct the following information is updated:
quick_keys - Which keys can be used
quick_rows - How many rows the key matches
RETURN VALUES
-1 if impossible select
0 if can't use quick_select
1 if found usable range
TODO
check if the function really needs to modify keys_to_use, and change the
code to pass it by reference if not
*/
int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
table_map prev_tables,