Package com.facebook.presto.sql.tree

Examples of com.facebook.presto.sql.tree.IsNullPredicate

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    }

    private static Expression toPredicate(Domain domain, QualifiedNameReference reference, Type type)
    {
        if (domain.getRanges().isNone()) {
            return domain.isNullAllowed() ? new IsNullPredicate(reference) : FALSE_LITERAL;
        }

        if (domain.getRanges().isAll()) {
            return domain.isNullAllowed() ? TRUE_LITERAL : new NotExpression(new IsNullPredicate(reference));
        }

        // Add disjuncts for ranges
        List<Expression> disjuncts = new ArrayList<>();
        List<Expression> singleValues = new ArrayList<>();
        for (Range range : domain.getRanges()) {
            checkState(!range.isAll()); // Already checked
            if (range.isSingleValue()) {
                singleValues.add(toExpression(range.getLow().getValue(), type));
            }
            else if (isBetween(range)) {
                // Specialize the range with BETWEEN expression if possible b/c it is currently more efficient
                disjuncts.add(new BetweenPredicate(reference, toExpression(range.getLow().getValue(), type), toExpression(range.getHigh().getValue(), type)));
            }
            else {
                List<Expression> rangeConjuncts = new ArrayList<>();
                if (!range.getLow().isLowerUnbounded()) {
                    switch (range.getLow().getBound()) {
                        case ABOVE:
                            rangeConjuncts.add(new ComparisonExpression(GREATER_THAN, reference, toExpression(range.getLow().getValue(), type)));
                            break;
                        case EXACTLY:
                            rangeConjuncts.add(new ComparisonExpression(GREATER_THAN_OR_EQUAL, reference, toExpression(range.getLow().getValue(),
                                    type)));
                            break;
                        case BELOW:
                            throw new IllegalStateException("Low Marker should never use BELOW bound: " + range);
                        default:
                            throw new AssertionError("Unhandled bound: " + range.getLow().getBound());
                    }
                }
                if (!range.getHigh().isUpperUnbounded()) {
                    switch (range.getHigh().getBound()) {
                        case ABOVE:
                            throw new IllegalStateException("High Marker should never use ABOVE bound: " + range);
                        case EXACTLY:
                            rangeConjuncts.add(new ComparisonExpression(LESS_THAN_OR_EQUAL, reference, toExpression(range.getHigh().getValue(), type)));
                            break;
                        case BELOW:
                            rangeConjuncts.add(new ComparisonExpression(LESS_THAN, reference, toExpression(range.getHigh().getValue(), type)));
                            break;
                        default:
                            throw new AssertionError("Unhandled bound: " + range.getHigh().getBound());
                    }
                }
                // If rangeConjuncts is null, then the range was ALL, which should already have been checked for
                checkState(!rangeConjuncts.isEmpty());
                disjuncts.add(combineConjuncts(rangeConjuncts));
            }
        }

        // Add back all of the possible single values either as an equality or an IN predicate
        if (singleValues.size() == 1) {
            disjuncts.add(new ComparisonExpression(EQUAL, reference, getOnlyElement(singleValues)));
        }
        else if (singleValues.size() > 1) {
            disjuncts.add(new InPredicate(reference, new InListExpression(singleValues)));
        }

        // Add nullability disjuncts
        checkState(!disjuncts.isEmpty());
        if (domain.isNullAllowed()) {
            disjuncts.add(new IsNullPredicate(reference));
        }
        return combineDisjunctsWithDefault(disjuncts, TRUE_LITERAL);
    }
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        protected Object visitIsNullPredicate(IsNullPredicate node, Object context)
        {
            Object value = process(node.getValue(), context);

            if (value instanceof Expression) {
                return new IsNullPredicate(toExpression(value, expressionTypes.get(node.getValue())));
            }

            return value == null;
        }
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        protected Object visitIsNullPredicate(IsNullPredicate node, Object context)
        {
            Object value = process(node.getValue(), context);

            if (value instanceof Expression) {
                return new IsNullPredicate(toExpression(value));
            }

            return value == null;
        }
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    }

    private static Expression toPredicate(Domain domain, QualifiedNameReference reference)
    {
        if (domain.getRanges().isNone()) {
            return domain.isNullAllowed() ? new IsNullPredicate(reference) : FALSE_LITERAL;
        }

        if (domain.getRanges().isAll()) {
            return domain.isNullAllowed() ? TRUE_LITERAL : new IsNotNullPredicate(reference);
        }

        // Add disjuncts for ranges
        List<Expression> disjuncts = new ArrayList<>();
        List<Expression> singleValues = new ArrayList<>();
        for (Range range : domain.getRanges()) {
            checkState(!range.isAll()); // Already checked
            if (range.isSingleValue()) {
                singleValues.add(toExpression(range.getLow().getValue()));
            }
            else if (isBetween(range)) {
                // Specialize the range with BETWEEN expression if possible b/c it is currently more efficient
                disjuncts.add(new BetweenPredicate(reference, toExpression(range.getLow().getValue()), toExpression(range.getHigh().getValue())));
            }
            else {
                List<Expression> rangeConjuncts = new ArrayList<>();
                if (!range.getLow().isLowerUnbounded()) {
                    switch (range.getLow().getBound()) {
                        case ABOVE:
                            rangeConjuncts.add(new ComparisonExpression(ComparisonExpression.Type.GREATER_THAN, reference, toExpression(range.getLow().getValue())));
                            break;
                        case EXACTLY:
                            rangeConjuncts.add(new ComparisonExpression(ComparisonExpression.Type.GREATER_THAN_OR_EQUAL, reference, toExpression(range.getLow().getValue())));
                            break;
                        case BELOW:
                            throw new IllegalStateException("Low Marker should never use BELOW bound: " + range);
                        default:
                            throw new AssertionError("Unhandled bound: " + range.getLow().getBound());
                    }
                }
                if (!range.getHigh().isUpperUnbounded()) {
                    switch (range.getHigh().getBound()) {
                        case ABOVE:
                            throw new IllegalStateException("High Marker should never use ABOVE bound: " + range);
                        case EXACTLY:
                            rangeConjuncts.add(new ComparisonExpression(ComparisonExpression.Type.LESS_THAN_OR_EQUAL, reference, toExpression(range.getHigh().getValue())));
                            break;
                        case BELOW:
                            rangeConjuncts.add(new ComparisonExpression(ComparisonExpression.Type.LESS_THAN, reference, toExpression(range.getHigh().getValue())));
                            break;
                        default:
                            throw new AssertionError("Unhandled bound: " + range.getHigh().getBound());
                    }
                }
                // If rangeConjuncts is null, then the range was ALL, which should already have been checked for
                checkState(!rangeConjuncts.isEmpty());
                disjuncts.add(combineConjuncts(rangeConjuncts));
            }
        }

        // Add back all of the possible single values either as an equality or an IN predicate
        if (singleValues.size() == 1) {
            disjuncts.add(new ComparisonExpression(EQUAL, reference, getOnlyElement(singleValues)));
        }
        else if (singleValues.size() > 1) {
            disjuncts.add(new InPredicate(reference, new InListExpression(singleValues)));
        }

        // Add nullability disjuncts
        checkState(!disjuncts.isEmpty());
        if (domain.isNullAllowed()) {
            disjuncts.add(new IsNullPredicate(reference));
        }
        return combineDisjunctsWithDefault(disjuncts, TRUE_LITERAL);
    }
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Related Classes of com.facebook.presto.sql.tree.IsNullPredicate

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  • com.facebook.presto.sql.planner.DomainTranslator
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  • com.facebook.presto.sql.planner.optimizations.CanonicalizeExpressions$CanonicalizeExpressionRewriter
  • com.facebook.presto.sql.planner.TestDomainTranslator
  • com.facebook.presto.sql.planner.TestEffectivePredicateExtractor
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