コード例 #1
0
ファイル: RelMdPredicates.java プロジェクト: gsvic/calcite
 RexNode compose(RexBuilder rexBuilder, Iterable<RexNode> exprs) {
   exprs =
       Linq4j.asEnumerable(exprs)
           .where(
               new Predicate1<RexNode>() {
                 public boolean apply(RexNode expr) {
                   return expr != null;
                 }
               });
   return RexUtil.composeConjunction(rexBuilder, exprs, false);
 }
コード例 #2
0
 /**
  * Computes the cube of bit sets.
  *
  * <p>For example, <code>rollup({0}, {1})</code> returns <code>({0, 1}, {0}, {})</code>.
  *
  * <p>Bit sets are not necessarily singletons: <code>rollup({0, 2}, {3, 5})</code> returns <code>
  * ({0, 2, 3, 5}, {0, 2}, {})</code>.
  */
 @VisibleForTesting
 public static ImmutableList<ImmutableBitSet> cube(List<ImmutableBitSet> bitSets) {
   // Given the bit sets [{1}, {2, 3}, {5}],
   // form the lists [[{1}, {}], [{2, 3}, {}], [{5}, {}]].
   final Set<List<ImmutableBitSet>> builder = Sets.newLinkedHashSet();
   for (ImmutableBitSet bitSet : bitSets) {
     builder.add(Arrays.asList(bitSet, ImmutableBitSet.of()));
   }
   Set<ImmutableBitSet> flattenedBitSets = Sets.newLinkedHashSet();
   for (List<ImmutableBitSet> o : Linq4j.product(builder)) {
     flattenedBitSets.add(ImmutableBitSet.union(o));
   }
   return ImmutableList.copyOf(flattenedBitSets);
 }