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Merged the implementation of MDEV-28 LIMIT ROWS EXAMINED into MariaDB 5.5.

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2012-03-12 00:45:18 +02:00
parent 96a21ab324 8aebd44e0e
commit ecbd868f58
18 changed files with 1655 additions and 55 deletions
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16
sql/sql_lex.h
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@@ -2568,6 +2568,22 @@ struct LEX: public Query_tables_list
into the select_lex.
*/
table_map used_tables;
/**
Maximum number of rows and/or keys examined by the query, both read,
changed or written. This is the argument of LIMIT ROWS EXAMINED.
The limit is represented by two variables - the Item is needed because
in case of parameters we have to delay its evaluation until execution.
Once evaluated, its value is stored in examined_rows_limit_cnt.
*/
Item *limit_rows_examined;
ulonglong limit_rows_examined_cnt;
inline void set_limit_rows_examined()
{
if (limit_rows_examined)
limit_rows_examined_cnt= limit_rows_examined->val_uint();
else
limit_rows_examined_cnt= ULONGLONG_MAX;
}
LEX();