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MCOL-1052. init_scan() initial implementation.

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This commit is contained in:
Roman Nozdrin
2018-03-22 17:12:56 +03:00
parent a03ecb7a8e
commit cff504c8bf
4 changed files with 246 additions and 19 deletions
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59
dbcon/mysql/ha_calpont.cpp
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@ -1139,28 +1139,73 @@ static MYSQL_SYSVAR_ULONG(
0);
#endif
/*@brief ha_calpont_impl_group_by_init - Get data for MariaDB group_by
pushdown handler
*/
/***********************************************************
* DESCRIPTION:
* Creates a group_by pushdown handler.
* Details are in server/sql/group_by_handler.h
* PARAMETERS:
* thd - THD pointer.
* query - Query structure, that describes the pushdown query.
* RETURN:
* group_by_handler if success
* NULL in other case
***********************************************************/
static group_by_handler *
create_calpont_group_by_handler(THD *thd, Query *query)
{
ha_calpont_group_by_handler *handler;
Item *item;
List_iterator_fast<Item> it(*query->select);
ha_calpont_group_by_handler *handler = NULL;
Item *item;
List_iterator_fast<Item> it(*query->select);
handler= new ha_calpont_group_by_handler(thd, query->select, query->from);
return handler;
if ( thd->infinidb_vtable.vtable_state != THD::INFINIDB_DISABLE_VTABLE )
{
handler = new ha_calpont_group_by_handler(thd, query);
}
return handler;
}
int ha_calpont_group_by_handler::init_scan()
{
DBUG_ENTER("ha_calpont_group_by_handler::init_scan");
int rc = ha_calpont_impl_group_by_init(query, table);
DBUG_RETURN(rc);
// return 0;
}
int ha_calpont_group_by_handler::next_row()
{
if (!first_row)
return(HA_ERR_END_OF_FILE);
// if (!first_row)
// return(HA_ERR_END_OF_FILE);
DBUG_ENTER("ha_calpont_group_by_handler::next_row");
int rc = ha_calpont_impl_group_by_next(query, table);
DBUG_RETURN(rc);
/*
first_row= 0;
Field *field = *(table->field);
field->store(5LL, 1);
field->set_notnull();
return(0);
*/
}
int ha_calpont_group_by_handler::end_scan()
{
DBUG_ENTER("ha_calpont_group_by_handler::end_scan");
int rc = ha_calpont_impl_group_by_end(query, table);
DBUG_RETURN(rc);
// return 0;
}
static struct st_mysql_sys_var* calpont_system_variables[] =
{
// MYSQL_SYSVAR(enum_var),