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Bug #43029: FORCE INDEX FOR ORDER BY is ignored when join

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buffering is used

FORCE INDEX FOR ORDER BY now prevents the optimizer from 
using join buffering. As a result the optimizer can use
indexed access on the first table and doesn't need to 
sort the complete resultset at the end of the statement.
This commit is contained in:
Georgi Kodinov
2009-10-07 18:03:42 +03:00
parent 482503d278
commit 5faf23bf55
8 changed files with 116 additions and 12 deletions
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sql/sql_parse.cc
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@@ -6258,6 +6258,7 @@ TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
ptr->table_name_length=table->table.length;
ptr->lock_type= lock_type;
ptr->updating= test(table_options & TL_OPTION_UPDATING);
/* TODO: remove TL_OPTION_FORCE_INDEX as it looks like it's not used */
ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
ptr->derived= table->sel;