C++ (Cpp) ExistsFilter::sub Examples

Example #1

File: ha_in_sub.cpp Project: DYFeng/infinidb

/**
 * 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);
}

Example #2

File: ha_in_sub.cpp Project: mariadb-corporation/mariadb-columnstore-engine

/** 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);
}