本文整理匯總了Java中org.apache.calcite.plan.RelOptPredicateList.of方法的典型用法代碼示例。如果您正苦於以下問題：Java RelOptPredicateList.of方法的具體用法？Java RelOptPredicateList.of怎麽用？Java RelOptPredicateList.of使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類org.apache.calcite.plan.RelOptPredicateList的用法示例。
在下文中一共展示了RelOptPredicateList.of方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: getPredicates
import org.apache.calcite.plan.RelOptPredicateList; //導入方法依賴的package包/類
/**
* Infers predicates for an Aggregate.
*
* <p>Pulls up predicates that only contains references to columns in the
* GroupSet. For e.g.
*
* <blockquote><pre>
* inputPullUpExprs : { a > 7, b + c < 10, a + e = 9}
* groupSet : { a, b}
* pulledUpExprs : { a > 7}
* </pre></blockquote>
*/
public RelOptPredicateList getPredicates(Aggregate agg, RelMetadataQuery mq) {
final RelNode input = agg.getInput();
final RexBuilder rexBuilder = agg.getCluster().getRexBuilder();
final RelOptPredicateList inputInfo = mq.getPulledUpPredicates(input);
final List<RexNode> aggPullUpPredicates = new ArrayList<>();
ImmutableBitSet groupKeys = agg.getGroupSet();
if (groupKeys.isEmpty()) {
// "GROUP BY ()" can convert an empty relation to a non-empty relation, so
// it is not valid to pull up predicates. In particular, consider the
// predicate "false": it is valid on all input rows (trivially - there are
// no rows!) but not on the output (there is one row).
return RelOptPredicateList.EMPTY;
}
Mapping m = Mappings.create(MappingType.PARTIAL_FUNCTION,
input.getRowType().getFieldCount(), agg.getRowType().getFieldCount());
int i = 0;
for (int j : groupKeys) {
m.set(j, i++);
}
for (RexNode r : inputInfo.pulledUpPredicates) {
ImmutableBitSet rCols = RelOptUtil.InputFinder.bits(r);
if (groupKeys.contains(rCols)) {
r = r.accept(new RexPermuteInputsShuttle(m, input));
aggPullUpPredicates.add(r);
}
}
return RelOptPredicateList.of(rexBuilder, aggPullUpPredicates);
}