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A fix and a test case for Bug#9520 "SELECT DISTINCT crashes server

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with cursor". The patch refactors do_select/sub_select
functions, which implement the nested loop algorithm, and reuses them to
fetch rows for cursors as well.
Pushing with view.test failing (--ps-protocol).
This commit is contained in:
konstantin@mysql.com
2005-04-30 09:54:35 +04:00
parent f35c1a1874
commit 6040b0abf6
4 changed files with 456 additions and 360 deletions
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18
sql/sql_select.h
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@ -91,7 +91,15 @@ enum join_type { JT_UNKNOWN,JT_SYSTEM,JT_CONST,JT_EQ_REF,JT_REF,JT_MAYBE_REF,
class JOIN;
typedef int (*Next_select_func)(JOIN *,struct st_join_table *,bool);
enum enum_nested_loop_state
{
NESTED_LOOP_KILLED= -2, NESTED_LOOP_ERROR= -1,
NESTED_LOOP_OK= 0, NESTED_LOOP_NO_MORE_ROWS= 1,
NESTED_LOOP_QUERY_LIMIT= 3, NESTED_LOOP_CURSOR_LIMIT= 4
};
typedef enum_nested_loop_state
(*Next_select_func)(JOIN *, struct st_join_table *, bool);
typedef int (*Read_record_func)(struct st_join_table *tab);
@ -162,6 +170,11 @@ class JOIN :public Sql_alloc
uint send_group_parts;
bool sort_and_group,first_record,full_join,group, no_field_update;
bool do_send_rows;
/*
TRUE when we want to resume nested loop iterations when
fetching data from a cursor
*/
bool resume_nested_loop;
table_map const_table_map,found_const_table_map,outer_join;
ha_rows send_records,found_records,examined_rows,row_limit, select_limit;
/*
@ -263,6 +276,7 @@ class JOIN :public Sql_alloc
sort_and_group= 0;
first_record= 0;
do_send_rows= 1;
resume_nested_loop= FALSE;
send_records= 0;
found_records= 0;
fetch_limit= HA_POS_ERROR;
@ -374,7 +388,7 @@ public:
void reset_thd(THD *thd);
int open(JOIN *join);
int fetch(ulong num_rows);
void fetch(ulong num_rows);
void reset() { join= 0; }
bool is_open() const { return join != 0; }
void close();