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MDEV-17096 Pushdown of simple derived tables to storage engines

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MDEV-17631 select_handler for a full query pushdown

Interfaces + Proof of Concept for federatedx with test cases.

The interfaces have been developed for integration of ColumnStore engine.
This commit is contained in:
Igor Babaev
2018-10-09 02:36:09 -07:00
parent 171fbbb968
commit 16327fc2e7
21 changed files with 1279 additions and 20 deletions
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75
sql/sql_select.cc
View File

@@ -64,6 +64,7 @@
#include "sys_vars_shared.h"
#include "sp_head.h"
#include "sp_rcontext.h"
#include "select_handler.h"
/*
A key part number that means we're using a fulltext scan.
@@ -1437,7 +1438,13 @@ int JOIN::optimize()
{
int res= 0;
join_optimization_state init_state= optimization_state;
if (optimization_state == JOIN::OPTIMIZATION_PHASE_1_DONE)
if (select_lex->pushdown_select)
{
if (!(select_options & SELECT_DESCRIBE))
res= select_lex->pushdown_select->init();
with_two_phase_optimization= false;
}
else if (optimization_state == JOIN::OPTIMIZATION_PHASE_1_DONE)
res= optimize_stage2();
else
{
@@ -3934,7 +3941,6 @@ void JOIN::exec_inner()
if (select_options & SELECT_DESCRIBE)
select_describe(this, FALSE, FALSE, FALSE,
(zero_result_cause?zero_result_cause:"No tables used"));
else
{
if (result->send_result_set_metadata(*columns_list,
@@ -4033,7 +4039,8 @@ void JOIN::exec_inner()
not the case.
*/
if (exec_const_order_group_cond.elements &&
!(select_options & SELECT_DESCRIBE))
!(select_options & SELECT_DESCRIBE) &&
!select_lex->pushdown_select)
{
List_iterator_fast<Item> const_item_it(exec_const_order_group_cond);
Item *cur_const_item;
@@ -4060,6 +4067,11 @@ void JOIN::exec_inner()
!table_count ? "No tables used" : NullS);
DBUG_VOID_RETURN;
}
else if (select_lex->pushdown_select)
{
error= select_lex->pushdown_select->execute();
DBUG_VOID_RETURN;
}
else
{
/* it's a const select, materialize it. */
@@ -4271,6 +4283,19 @@ mysql_select(THD *thd,
}
}
select_lex->select_h= select_lex->find_select_handler(thd);
if (select_lex->select_h)
{
if (!(select_lex->pushdown_select=
new (thd->mem_root) Pushdown_select(select_lex,
select_lex->select_h)))
{
delete select_lex->select_h;
select_lex->select_h= NULL;
DBUG_RETURN(TRUE);
}
}
if ((err= join->optimize()))
{
goto err; // 1
@@ -4292,8 +4317,15 @@ mysql_select(THD *thd,
select_lex->where= join->conds_history;
select_lex->having= join->having_history;
}
err:
if (select_lex->pushdown_select)
{
delete select_lex->pushdown_select;
select_lex->pushdown_select= NULL;
}
if (free_join)
{
THD_STAGE_INFO(thd, stage_end);
@@ -25681,6 +25713,7 @@ bool mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
DBUG_ENTER("mysql_explain_union");
bool res= 0;
SELECT_LEX *first= unit->first_select();
bool is_pushed_union= unit->derived && unit->derived->pushdown_derived;
for (SELECT_LEX *sl= first; sl; sl= sl->next_select())
{
@@ -25698,9 +25731,12 @@ bool mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
}
if (!(res= unit->prepare(unit->derived, result,
SELECT_NO_UNLOCK | SELECT_DESCRIBE)))
res= unit->exec();
{
if (!is_pushed_union)
res= unit->exec();
}
}
else
else
{
thd->lex->current_select= first;
unit->set_limit(unit->global_parameters());
@@ -25716,6 +25752,13 @@ bool mysql_explain_union(THD *thd, SELECT_LEX_UNIT *unit, select_result *result)
first->options | thd->variables.option_bits | SELECT_DESCRIBE,
result, unit, first);
}
if (unit->derived && unit->derived->pushdown_derived)
{
delete unit->derived->pushdown_derived;
unit->derived->pushdown_derived= NULL;
}
DBUG_RETURN(res || thd->is_error());
}
@@ -27367,6 +27410,26 @@ Item *remove_pushed_top_conjuncts(THD *thd, Item *cond)
return cond;
}
select_handler *SELECT_LEX::find_select_handler(THD *thd)
{
if (next_select())
return 0;
if (master_unit()->outer_select())
return 0;
for (TABLE_LIST *tbl= join->tables_list; tbl; tbl= tbl->next_local)
{
if (!tbl->table)
continue;
handlerton *ht= tbl->table->file->partition_ht();
if (!ht->create_select)
continue;
select_handler *sh= ht->create_select(thd, this);
return sh;
}
return 0;
}
/**
@} (end of group Query_Optimizer)
*/