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move internal API out from group_by_handler

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into a Pushdown_query object
This commit is contained in:
Sergei Golubchik
2015-10-02 10:19:40 +02:00
parent 9ca3d9ea9c
commit 7ca8b4bbfa
6 changed files with 64 additions and 66 deletions
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29
sql/group_by_handler.h
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@ -18,7 +18,7 @@
This file implements the group_by_handler interface. This interface
can be used by storage handlers that can intercept summary or GROUP
BY queries from MariaDB and itself return the result to the user or
upper level.
upper level. It is part of the Storage Engine API
Both main and sub queries are supported. Here are some examples of what the
storage engine could intersept:
@ -30,35 +30,26 @@
SELECT a, (select sum(*) from t2 where t1.a=t2.a) from t2;
*/
class JOIN;
class group_by_handler
{
public:
/* Arguments for group_by_handler, for usage later */
THD *thd;
SELECT_LEX *select_lex;
List<Item> *fields;
TABLE_LIST *table_list;
ORDER *group_by, *order_by;
Item *where, *having;
handlerton *ht; /* storage engine of this handler */
handlerton *ht;
/* Temporary table where all results should be stored in record[0] */
TABLE *table;
bool store_data_in_temp_table; /* Set by mariadb */
group_by_handler(THD *thd_arg, SELECT_LEX *select_lex_arg,
List<Item> *fields_arg,
group_by_handler(THD *thd_arg, List<Item> *fields_arg,
TABLE_LIST *table_list_arg, ORDER *group_by_arg,
ORDER *order_by_arg, Item *where_arg,
Item *having_arg, handlerton *ht_arg)
: thd(thd_arg), select_lex(select_lex_arg), fields(fields_arg),
table_list(table_list_arg), group_by(group_by_arg),
order_by(order_by_arg), where(where_arg), having(having_arg),
ht(ht_arg), table(0), store_data_in_temp_table(0)
{}
ORDER *order_by_arg, Item *where_arg, Item *having_arg,
handlerton *ht_arg)
: thd(thd_arg), fields(fields_arg), table_list(table_list_arg),
group_by(group_by_arg), order_by(order_by_arg), where(where_arg),
having(having_arg), ht(ht_arg), table(0) {}
virtual ~group_by_handler() {}
/*
@ -118,9 +109,7 @@ public:
/* End scanning */
virtual int end_scan()=0;
/* Function that calls the above scan functions */
int execute(JOIN *join);
/* Report errors */
virtual void print_error(int error, myf errflag);
};