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MDEV-18553: MDEV-16327 pre-requisits part 1: isolation of LIMIT/OFFSET handling

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This commit is contained in:
Oleksandr Byelkin
2019-09-26 09:49:50 +02:00
parent 8336371441
commit eb0804ef5e
18 changed files with 198 additions and 154 deletions
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5
sql/sql_lex.h
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@@ -32,6 +32,7 @@
#include "sp.h" // enum stored_procedure_type
#include "sql_tvc.h"
#include "item.h"
#include "sql_limit.h" // Select_limit_counters
/* Used for flags of nesting constructs */
#define SELECT_NESTING_MAP_SIZE 64
@@ -829,6 +830,8 @@ void create_explain_query(LEX *lex, MEM_ROOT *mem_root);
void create_explain_query_if_not_exists(LEX *lex, MEM_ROOT *mem_root);
bool print_explain_for_slow_log(LEX *lex, THD *thd, String *str);
class st_select_lex_unit: public st_select_lex_node {
protected:
TABLE_LIST result_table_list;
@@ -908,7 +911,7 @@ public:
//node on which we should return current_select pointer after parsing subquery
st_select_lex *return_to;
/* LIMIT clause runtime counters */
ha_rows select_limit_cnt, offset_limit_cnt;
Select_limit_counters lim;
/* not NULL if unit used in subselect, point to subselect item */
Item_subselect *item;
/*