diff options
Diffstat (limited to 'sql/sql_select.h')
| -rw-r--r-- | sql/sql_select.h | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/sql/sql_select.h b/sql/sql_select.h index 271c88ebf66..d8f1769397c 100644 --- a/sql/sql_select.h +++ b/sql/sql_select.h @@ -58,6 +58,8 @@ class store_key; typedef struct st_table_ref { bool key_err; + /** True if something was read into buffer in join_read_key. */ + bool has_record; uint key_parts; ///< num of ... uint key_length; ///< length of key_buff int key; ///< key no @@ -85,6 +87,11 @@ typedef struct st_table_ref table_map depend_map; ///< Table depends on these tables. /* null byte position in the key_buf. Used for REF_OR_NULL optimization */ uchar *null_ref_key; + /* + The number of times the record associated with this key was used + in the join. + */ + ha_rows use_count; } TABLE_REF; @@ -278,7 +285,14 @@ public: TABLE **table,**all_tables,*sort_by_table; uint tables,const_tables; uint send_group_parts; - bool sort_and_group,first_record,full_join,group, no_field_update; + /** + Indicates that grouping will be performed on the result set during + query execution. This field belongs to query execution. + + @see make_group_fields, alloc_group_fields, JOIN::exec + */ + bool sort_and_group; + bool first_record,full_join,group, no_field_update; bool do_send_rows; /** TRUE when we want to resume nested loop iterations when @@ -365,6 +379,8 @@ public: simple_xxxxx is set if ORDER/GROUP BY doesn't include any references to other tables than the first non-constant table in the JOIN. It's also set if ORDER/GROUP BY is empty. + Used for deciding for or against using a temporary table to compute + GROUP/ORDER BY. */ bool simple_order, simple_group; /** @@ -435,6 +451,7 @@ public: const_tables= 0; eliminated_tables= 0; join_list= 0; + implicit_grouping= FALSE; sort_and_group= 0; first_record= 0; do_send_rows= 1; @@ -511,6 +528,7 @@ public: } bool rollup_init(); + bool rollup_process_const_fields(); bool rollup_make_fields(List<Item> &all_fields, List<Item> &fields, Item_sum ***func); int rollup_send_data(uint idx); @@ -544,6 +562,11 @@ public: return (table_map(1) << tables) - 1; } private: + /** + TRUE if the query contains an aggregate function but has no GROUP + BY clause. + */ + bool implicit_grouping; bool make_simple_join(JOIN *join, TABLE *tmp_table); }; |