Examples with DirectGroupByHandler com.actiontech.dble.backend.mysql.nio.handler.query.impl.groupby.DirectGroupByHandler used on opensource projects

Example 1 with DirectGroupByHandler

use of com.actiontech.dble.backend.mysql.nio.handler.query.impl.groupby.DirectGroupByHandler in project dble by actiontech.

the class BaseHandlerBuilder method buildCommon.

/**
 * build common properties,like where,groupby,having,orderby,limit, and sendMakHandler(rename)
 */
protected void buildCommon() {
    if (node.getWhereFilter() != null && needWhereHandler) {
        WhereHandler wh = new WhereHandler(getSequenceId(), session, node.getWhereFilter());
        addHandler(wh);
    }
    /* need groupby handler */
    if (nodeHasGroupBy(node)) {
        boolean needOrderBy = (node.getGroupBys().size() > 0) && isOrderNeeded(node, node.getGroupBys());
        boolean canDirectGroupBy = true;
        List<ItemSum> sumRefs = new ArrayList<>();
        for (ItemSum funRef : node.getSumFuncs()) {
            if (funRef.hasWithDistinct() || funRef.sumType().equals(ItemSum.SumFuncType.GROUP_CONCAT_FUNC))
                canDirectGroupBy = false;
            sumRefs.add(funRef);
        }
        if (needOrderBy) {
            if (canDirectGroupBy) {
                // we go direct groupby
                DirectGroupByHandler gh = new DirectGroupByHandler(getSequenceId(), session, node.getGroupBys(), sumRefs);
                addHandler(gh);
            } else {
                OrderByHandler oh = new OrderByHandler(getSequenceId(), session, node.getGroupBys());
                addHandler(oh);
                OrderedGroupByHandler gh = new OrderedGroupByHandler(getSequenceId(), session, node.getGroupBys(), sumRefs);
                addHandler(gh);
            }
        } else {
            // @bug 1052 canDirectGroupby condition we use
            // directgroupby already
            OrderedGroupByHandler gh = new OrderedGroupByHandler(getSequenceId(), session, node.getGroupBys(), sumRefs);
            addHandler(gh);
        }
    }
    // having
    if (node.getHavingFilter() != null) {
        HavingHandler hh = new HavingHandler(getSequenceId(), session, node.getHavingFilter());
        addHandler(hh);
    }
    if (node.isDistinct() && node.getOrderBys().size() > 0) {
        // distinct and order by both exists
        List<Order> mergedOrders = mergeOrderBy(node.getColumnsSelected(), node.getOrderBys());
        if (mergedOrders == null) {
            // can not merge,need distinct then order by
            DistinctHandler dh = new DistinctHandler(getSequenceId(), session, node.getColumnsSelected());
            addHandler(dh);
            OrderByHandler oh = new OrderByHandler(getSequenceId(), session, node.getOrderBys());
            addHandler(oh);
        } else {
            DistinctHandler dh = new DistinctHandler(getSequenceId(), session, node.getColumnsSelected(), mergedOrders);
            addHandler(dh);
        }
    } else {
        if (node.isDistinct()) {
            DistinctHandler dh = new DistinctHandler(getSequenceId(), session, node.getColumnsSelected());
            addHandler(dh);
        }
        // order by
        if (node.getOrderBys().size() > 0) {
            if (node.getGroupBys().size() > 0) {
                if (!PlanUtil.orderContains(node.getGroupBys(), node.getOrderBys())) {
                    OrderByHandler oh = new OrderByHandler(getSequenceId(), session, node.getOrderBys());
                    addHandler(oh);
                }
            } else if (isOrderNeeded(node, node.getOrderBys())) {
                OrderByHandler oh = new OrderByHandler(getSequenceId(), session, node.getOrderBys());
                addHandler(oh);
            }
        }
    }
    if (node.getLimitTo() > 0) {
        LimitHandler lh = new LimitHandler(getSequenceId(), session, node.getLimitFrom(), node.getLimitTo());
        addHandler(lh);
    }
}