Examples with NullOrdering org.teiid.language.SortSpecification.NullOrdering used on opensource projects

Example 1 with NullOrdering

use of org.teiid.language.SortSpecification.NullOrdering in project teiid by teiid.

the class ListNestedSortComparator method compare.

/**
 * Compares its two arguments for order.  Returns a negative integer,
 * zero, or a positive integer as the first argument is less than,
 * equal to, or greater than the second. <p>
 *
 * The <code>compare</code> method returns <p>
 * <ul>
 *      <li>-1 if object1 less than object 2 </li>
 *      <li> 0 if object1 equal to object 2 </li>
 *      <li>+1 if object1 greater than object 2 </li>
 * </ul>
 *
 * @param o1 The first object being compared
 * @param o2 The second object being compared
 */
public int compare(java.util.List<T> list1, java.util.List<T> list2) {
    if (!init) {
        if (nullOrdering == null) {
            nullOrdering = Collections.nCopies(sortParameters.length, null);
        }
        for (int i = 0; i < sortParameters.length; i++) {
            if (nullOrdering.get(i) == null) {
                if (defaultNullOrder == NullOrder.FIRST) {
                    nullOrdering.set(i, NullOrdering.FIRST);
                } else if (defaultNullOrder == NullOrder.LAST) {
                    nullOrdering.set(i, NullOrdering.LAST);
                }
            }
        }
        if (defaultNullOrder == NullOrder.HIGH) {
            nullValue = 1;
        }
        init = true;
    }
    int compare = 0;
    for (int k = 0; k < sortParameters.length; k++) {
        if (list1.size() <= sortParameters[k]) {
            return 1;
        }
        T param1 = list1.get(sortParameters[k]);
        if (list2.size() <= sortParameters[k]) {
            return -1;
        }
        T param2 = list2.get(sortParameters[k]);
        if (param1 == null) {
            if (param2 == null) {
                // Both are null
                compare = 0;
            } else {
                // param1 = null, so is less than a non-null
                compare = nullValue;
                NullOrdering no = getNullOrdering(k);
                if (no == NullOrdering.FIRST) {
                    return -1;
                }
                if (no == NullOrdering.LAST) {
                    return 1;
                }
            }
        } else if (param2 == null) {
            // param1 != null, param2 == null
            compare = -nullValue;
            NullOrdering no = getNullOrdering(k);
            if (no == NullOrdering.FIRST) {
                return 1;
            }
            if (no == NullOrdering.LAST) {
                return -1;
            }
        } else {
            compare = Constant.COMPARATOR.compare(param1, param2);
        }
        if (compare != 0) {
            boolean asc = orderTypes != null ? orderTypes.get(k) : this.ascendingOrder;
            return asc ? compare : -compare;
        } else if (k == distinctIndex) {
            isDistinct = false;
        }
    }
    return 0;
}

Example 2 with NullOrdering

use of org.teiid.language.SortSpecification.NullOrdering in project teiid by teiid.

the class GroupingNode method collectionPhase.

private void collectionPhase() {
    if (this.orderBy == null) {
        // No need to sort
        this.groupTupleSource = getGroupSortTupleSource();
        this.phase = GROUP;
    } else {
        List<NullOrdering> nullOrdering = new ArrayList<NullOrdering>(orderBy.size());
        List<Boolean> sortTypes = new ArrayList<Boolean>(orderBy.size());
        int size = orderBy.size();
        if (this.removeDuplicates) {
            // sort on all inputs
            size = distinctCols;
        }
        int[] sortIndexes = new int[size];
        for (int i = 0; i < size; i++) {
            int index = i;
            if (i < this.orderBy.size()) {
                OrderByItem item = this.orderBy.get(i);
                nullOrdering.add(item.getNullOrdering());
                sortTypes.add(item.isAscending());
                index = collectedExpressions.get(SymbolMap.getExpression(item.getSymbol()));
            } else {
                nullOrdering.add(null);
                sortTypes.add(OrderBy.ASC);
            }
            sortIndexes[i] = index;
        }
        this.indexes = Arrays.copyOf(sortIndexes, orderBy.size());
        if (rollup) {
            this.indexMap = new HashMap<Integer, Integer>();
            for (int i = 0; i < indexes.length; i++) {
                this.indexMap.put(indexes[i], orderBy.size() - i);
            }
        } else if (!removeDuplicates) {
            boolean groupSort = true;
            List<AggregateFunction> aggs = new ArrayList<AggregateFunction>();
            List<Class<?>> allTypes = new ArrayList<Class<?>>();
            accumulatorStateCount = new int[this.functions.length];
            for (AggregateFunction[] afs : this.functions) {
                if (afs[0] instanceof ConstantFunction) {
                    continue;
                }
                aggs.add(afs[0]);
                List<? extends Class<?>> types = afs[0].getStateTypes();
                if (types == null) {
                    groupSort = false;
                    break;
                }
                accumulatorStateCount[aggs.size() - 1] = types.size();
                allTypes.addAll(types);
            }
            if (groupSort) {
                this.groupSortfunctions = aggs.toArray(new AggregateFunction[aggs.size()]);
                List<Expression> schema = new ArrayList<Expression>();
                for (OrderByItem item : this.orderBy) {
                    schema.add(SymbolMap.getExpression(item.getSymbol()));
                }
                List<? extends Expression> elements = getElements();
                this.projection = new int[elements.size()];
                int index = 0;
                for (int i = 0; i < elements.size(); i++) {
                    Expression symbol = elements.get(i);
                    if (this.outputMapping != null) {
                        symbol = outputMapping.getMappedExpression((ElementSymbol) symbol);
                    }
                    if (symbol instanceof AggregateSymbol) {
                        projection[i] = schema.size() + index++;
                    } else {
                        projection[i] = schema.indexOf(symbol);
                    }
                }
                // add in accumulator value types
                for (Class<?> type : allTypes) {
                    ElementSymbol es = new ElementSymbol("x");
                    es.setType(type);
                    schema.add(es);
                }
                tree = this.getBufferManager().createSTree(schema, this.getConnectionID(), orderBy.size());
                // non-default order needs to update the comparator
                tree.getComparator().setNullOrdering(nullOrdering);
                tree.getComparator().setOrderTypes(sortTypes);
                this.groupSortTupleSource = this.getGroupSortTupleSource();
                this.phase = GROUP_SORT;
                return;
            }
        }
        this.sortUtility = new SortUtility(getGroupSortTupleSource(), removeDuplicates ? Mode.DUP_REMOVE_SORT : Mode.SORT, getBufferManager(), getConnectionID(), new ArrayList<Expression>(collectedExpressions.keySet()), sortTypes, nullOrdering, sortIndexes);
        this.phase = SORT;
    }
}