/**
* This is invoked when a NOT function is got. It's usually the case NOT<IN optimizer>
* This function will simple turn the semi join to anti join
*
*/
void InSub::handleNot()
{
ParseTree *pt = fGwip.ptWorkStack.top();
ExistsFilter *subFilter = dynamic_cast<ExistsFilter*>(pt->data());
idbassert(subFilter);
subFilter->notExists(true);
SCSEP csep = subFilter->sub();
const ParseTree* ptsub = csep->filters();
if (ptsub)
ptsub->walk(makeAntiJoin);
ptsub = csep->having();
if (ptsub)
ptsub->walk(makeAntiJoin);
}
/** MySQL transform (NOT) IN subquery to (NOT) EXIST
*
*/
execplan::ParseTree* InSub::transform()
{
if (!fFunc)
return NULL;
// @todo need to handle scalar IN and BETWEEN specially
// this blocks handles only one subselect scalar
// arg[0]: column | arg[1]: subselect
//assert (fFunc->argument_count() == 2 && fGwip.rcWorkStack.size() >= 2);
if (fFunc->argument_count() != 2 || fGwip.rcWorkStack.size() < 2)
{
fGwip.fatalParseError = true;
fGwip.parseErrorText = "Unsupported item in IN subquery";
return NULL;
}
ReturnedColumn* rhs = fGwip.rcWorkStack.top();
fGwip.rcWorkStack.pop();
delete rhs;
ReturnedColumn* lhs = fGwip.rcWorkStack.top();
fGwip.rcWorkStack.pop();
delete lhs;
fSub = (Item_subselect*)(fFunc->arguments()[1]);
idbassert(fSub && fFunc);
SCSEP csep (new CalpontSelectExecutionPlan());
csep->sessionID(fGwip.sessionid);
csep->location(CalpontSelectExecutionPlan::WHERE);
csep->subType (CalpontSelectExecutionPlan::IN_SUBS);
// gwi for the sub query
gp_walk_info gwi;
gwi.thd = fGwip.thd;
gwi.subQuery = this;
// @4827 merge table list to gwi in case there is FROM sub to be referenced
// in the FROM sub
gwi.derivedTbCnt = fGwip.derivedTbList.size();
uint32_t tbCnt = fGwip.tbList.size();
gwi.tbList.insert(gwi.tbList.begin(), fGwip.tbList.begin(), fGwip.tbList.end());
gwi.derivedTbList.insert(gwi.derivedTbList.begin(), fGwip.derivedTbList.begin(), fGwip.derivedTbList.end());
if (getSelectPlan(gwi, *(fSub->get_select_lex()), csep) != 0)
{
fGwip.fatalParseError = true;
if (gwi.fatalParseError && !gwi.parseErrorText.empty())
fGwip.parseErrorText = gwi.parseErrorText;
else
fGwip.parseErrorText = "Error occured in InSub::transform()";
return NULL;
}
// remove outer query tables
CalpontSelectExecutionPlan::TableList tblist;
if (csep->tableList().size() >= tbCnt)
tblist.insert(tblist.begin(), csep->tableList().begin() + tbCnt, csep->tableList().end());
CalpontSelectExecutionPlan::SelectList derivedTbList;
if (csep->derivedTableList().size() >= gwi.derivedTbCnt)
derivedTbList.insert(derivedTbList.begin(),
csep->derivedTableList().begin() + gwi.derivedTbCnt,
csep->derivedTableList().end());
csep->tableList(tblist);
csep->derivedTableList(derivedTbList);
ExistsFilter* subFilter = new ExistsFilter();
subFilter->sub(csep);
if (gwi.subQuery->correlated())
subFilter->correlated(true);
else
subFilter->correlated(false);
if (fGwip.clauseType == HAVING && subFilter->correlated())
{
fGwip.fatalParseError = true;
fGwip.parseErrorText = logging::IDBErrorInfo::instance()->errorMsg(logging::ERR_NON_SUPPORT_HAVING);
}
fGwip.subselectList.push_back(csep);
return new ParseTree(subFilter);
}