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MCOL-1052 WIP Replace SimpleColumn with ConstantColumn when server pushes equal predicate using cond_push.

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This commit is contained in:
Roman Nozdrin
2018-04-29 21:13:11 +03:00
parent f8c08f8b0b
commit fdbf82e48d
3 changed files with 100 additions and 5 deletions
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81
dbcon/mysql/ha_calpont_execplan.cpp
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@ -8003,6 +8003,55 @@ int cp_get_group_plan(THD* thd, SCSEP& csep, cal_impl_if::cal_group_info& gi)
return 0;
}
/*@brief buildConstColFromFilter- change SimpleColumn into ConstColumn*/
/***********************************************************
* DESCRIPTION:
* Server could optimize out fields from GROUP BY list, when certain
* filter predicate is used, e.g.
* field = 'AIR', field IN ('AIR'). This utility function tries to
* replace such fields with ConstantColumns using cond_pushed filters.
* PARAMETERS:
* originalSC SimpleColumn* removed field
* gwi main strucutre
* gi auxilary group_by handler structure
* RETURNS
* ConstantColumn* if originalSC equals with cond_pushed columns.
* NULL otherwise
***********************************************************/
ConstantColumn* buildConstColFromFilter(SimpleColumn* originalSC,
gp_walk_info& gwi, cal_group_info& gi)
{
execplan::SimpleColumn* simpleCol;
execplan::ConstantColumn* constCol;
execplan::SOP op;
execplan::SimpleFilter* simpFilter;
execplan::ConstantColumn* result = NULL;
std::vector<ParseTree*>::iterator ptIt = gi.pushedPts.begin();
for(; ptIt != gi.pushedPts.end(); ptIt++)
{
simpFilter = dynamic_cast<execplan::SimpleFilter*>((*ptIt)->data());
if (simpFilter == NULL)
continue;
simpleCol = dynamic_cast<execplan::SimpleColumn*>(simpFilter->lhs());
constCol = dynamic_cast<execplan::ConstantColumn*>(simpFilter->rhs());
if(simpleCol == NULL || constCol == NULL)
continue;
op = simpFilter->op();
if ( originalSC->sameColumn(dynamic_cast<execplan::ReturnedColumn*>(simpleCol))
&& op.get()->op() == OP_EQ && constCol)
{
#ifdef DEBUG_WALK_COND
cerr << "buildConstColFromFilter() replaced " << endl;
cerr << simpleCol->toString() << endl;
cerr << " with " << endl;
cerr << constCol << endl;
#endif
result = constCol;
}
}
return result;
}
int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_group_info& gi, bool isUnion)
{
#ifdef DEBUG_WALK_COND
@ -8284,7 +8333,9 @@ int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_gro
if (filters)
{
csep->filters(filters);
#ifdef DEBUG_WALK_COND
filters->drawTree("/tmp/filter1.dot");
#endif
}
gwi.clauseType = SELECT;
@ -8346,6 +8397,7 @@ int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_gro
{
Item_field* ifp = (Item_field*)item;
SimpleColumn* sc = NULL;
ConstantColumn* constCol = NULL;
if (ifp->field_name && string(ifp->field_name) == "*")
{
@ -8357,6 +8409,8 @@ int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_gro
if (sc)
{
constCol = buildConstColFromFilter(sc, gwi, gi);
boost::shared_ptr<ConstantColumn> spcc(constCol);
boost::shared_ptr<SimpleColumn> spsc(sc);
if (sel_cols_in_create.length() != 0)
@ -8386,10 +8440,19 @@ int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_gro
escapeBackTick(itemAlias.empty() ? ifp->name : itemAlias.c_str()) + "`");
else
gwi.selectCols.push_back("`" + escapeBackTick((itemAlias.empty() ? ifp->name : itemAlias.c_str())) + "`");
gwi.returnedCols.push_back(spsc);
gwi.columnMap.insert(CalpontSelectExecutionPlan::ColumnMap::value_type(string(ifp->field_name), spsc));
// MCOL-1052 Replace SimpleColumn with ConstantColumn,
// since it must have a single value only.
if(constCol)
{
gwi.returnedCols.push_back(spcc);
gwi.columnMap.insert(CalpontSelectExecutionPlan::ColumnMap::value_type(string(ifp->field_name), spcc));
}
else
{
gwi.returnedCols.push_back(spsc);
gwi.columnMap.insert(CalpontSelectExecutionPlan::ColumnMap::value_type(string(ifp->field_name), spsc));
}
TABLE_LIST* tmp = 0;
if (ifp->cached_table)
@ -9348,11 +9411,19 @@ int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_gro
if( rc->sameColumn((*iter).get()) )
break;
}
// MCOL-1052 Find and remove the optimized field
// from ORDER using cond_pushed filters.
if(buildConstColFromFilter(
dynamic_cast<SimpleColumn*>(rc),gwi, gi))
{
break;
}
// MCOL-1052 GROUP BY items list doesn't contain
// this ORDER BY item.
if ( iter == gwi.groupByCols.end() )
{
Item_ident *iip = reinterpret_cast<Item_ident*>(ord_item);
Item_ident *iip = reinterpret_cast<Item_ident*>(ord_item);
std::ostringstream ostream;
ostream << "'";
if (iip->db_name)