Examples with ComparisonExpressionType com.facebook.presto.sql.tree.ComparisonExpressionType used on opensource projects

Example 1 with ComparisonExpressionType

use of com.facebook.presto.sql.tree.ComparisonExpressionType in project presto by prestodb.

the class TestInterpretedFilterFunction method testComparisonExpressionWithNulls.

@Test
public void testComparisonExpressionWithNulls() {
    for (ComparisonExpressionType type : ComparisonExpressionType.values()) {
        if (type == ComparisonExpressionType.IS_DISTINCT_FROM) {
            // IS DISTINCT FROM has different NULL semantics
            continue;
        }
        assertFilter(format("NULL %s NULL", type.getValue()), false);
        assertFilter(format("42 %s NULL", type.getValue()), false);
        assertFilter(format("NULL %s 42", type.getValue()), false);
        assertFilter(format("11.1 %s NULL", type.getValue()), false);
        assertFilter(format("NULL %s 11.1", type.getValue()), false);
    }
}

Example 2 with ComparisonExpressionType

use of com.facebook.presto.sql.tree.ComparisonExpressionType in project presto by prestodb.

the class RelationPlanner method visitJoin.

@Override
protected RelationPlan visitJoin(Join node, Void context) {
    // TODO: translate the RIGHT join into a mirrored LEFT join when we refactor (@martint)
    RelationPlan leftPlan = process(node.getLeft(), context);
    // Convert CROSS JOIN UNNEST to an UnnestNode
    if (node.getRight() instanceof Unnest || (node.getRight() instanceof AliasedRelation && ((AliasedRelation) node.getRight()).getRelation() instanceof Unnest)) {
        Unnest unnest;
        if (node.getRight() instanceof AliasedRelation) {
            unnest = (Unnest) ((AliasedRelation) node.getRight()).getRelation();
        } else {
            unnest = (Unnest) node.getRight();
        }
        if (node.getType() != Join.Type.CROSS && node.getType() != Join.Type.IMPLICIT) {
            throw notSupportedException(unnest, "UNNEST on other than the right side of CROSS JOIN");
        }
        return planCrossJoinUnnest(leftPlan, node, unnest);
    }
    RelationPlan rightPlan = process(node.getRight(), context);
    PlanBuilder leftPlanBuilder = initializePlanBuilder(leftPlan);
    PlanBuilder rightPlanBuilder = initializePlanBuilder(rightPlan);
    // NOTE: symbols must be in the same order as the outputDescriptor
    List<Symbol> outputSymbols = ImmutableList.<Symbol>builder().addAll(leftPlan.getFieldMappings()).addAll(rightPlan.getFieldMappings()).build();
    ImmutableList.Builder<JoinNode.EquiJoinClause> equiClauses = ImmutableList.builder();
    List<Expression> complexJoinExpressions = new ArrayList<>();
    List<Expression> postInnerJoinConditions = new ArrayList<>();
    if (node.getType() != Join.Type.CROSS && node.getType() != Join.Type.IMPLICIT) {
        Expression criteria = analysis.getJoinCriteria(node);
        RelationType left = analysis.getOutputDescriptor(node.getLeft());
        RelationType right = analysis.getOutputDescriptor(node.getRight());
        List<Expression> leftComparisonExpressions = new ArrayList<>();
        List<Expression> rightComparisonExpressions = new ArrayList<>();
        List<ComparisonExpressionType> joinConditionComparisonTypes = new ArrayList<>();
        for (Expression conjunct : ExpressionUtils.extractConjuncts(criteria)) {
            conjunct = ExpressionUtils.normalize(conjunct);
            if (!isEqualComparisonExpression(conjunct) && node.getType() != INNER) {
                complexJoinExpressions.add(conjunct);
                continue;
            }
            Set<QualifiedName> dependencies = DependencyExtractor.extractNames(conjunct, analysis.getColumnReferences());
            boolean isJoinUsing = node.getCriteria().filter(JoinUsing.class::isInstance).isPresent();
            if (!isJoinUsing && (dependencies.stream().allMatch(left::canResolve) || dependencies.stream().allMatch(right::canResolve))) {
                // If the conjunct can be evaluated entirely with the inputs on either side of the join, add
                // it to the list complex expressions and let the optimizers figure out how to push it down later.
                // Due to legacy reasons, the expression for "join using" looks like "x = x", which (incorrectly)
                // appears to fit the condition we're after. So we skip them.
                complexJoinExpressions.add(conjunct);
            } else if (conjunct instanceof ComparisonExpression) {
                Expression firstExpression = ((ComparisonExpression) conjunct).getLeft();
                Expression secondExpression = ((ComparisonExpression) conjunct).getRight();
                ComparisonExpressionType comparisonType = ((ComparisonExpression) conjunct).getType();
                Set<QualifiedName> firstDependencies = DependencyExtractor.extractNames(firstExpression, analysis.getColumnReferences());
                Set<QualifiedName> secondDependencies = DependencyExtractor.extractNames(secondExpression, analysis.getColumnReferences());
                if (firstDependencies.stream().allMatch(left::canResolve) && secondDependencies.stream().allMatch(right::canResolve)) {
                    leftComparisonExpressions.add(firstExpression);
                    rightComparisonExpressions.add(secondExpression);
                    joinConditionComparisonTypes.add(comparisonType);
                } else if (firstDependencies.stream().allMatch(right::canResolve) && secondDependencies.stream().allMatch(left::canResolve)) {
                    leftComparisonExpressions.add(secondExpression);
                    rightComparisonExpressions.add(firstExpression);
                    joinConditionComparisonTypes.add(comparisonType.flip());
                } else {
                    // the case when we mix symbols from both left and right join side on either side of condition.
                    complexJoinExpressions.add(conjunct);
                }
            } else {
                complexJoinExpressions.add(conjunct);
            }
        }
        leftPlanBuilder = subqueryPlanner.handleSubqueries(leftPlanBuilder, leftComparisonExpressions, node);
        rightPlanBuilder = subqueryPlanner.handleSubqueries(rightPlanBuilder, rightComparisonExpressions, node);
        // Add projections for join criteria
        leftPlanBuilder = leftPlanBuilder.appendProjections(leftComparisonExpressions, symbolAllocator, idAllocator);
        rightPlanBuilder = rightPlanBuilder.appendProjections(rightComparisonExpressions, symbolAllocator, idAllocator);
        for (int i = 0; i < leftComparisonExpressions.size(); i++) {
            if (joinConditionComparisonTypes.get(i) == ComparisonExpressionType.EQUAL) {
                Symbol leftSymbol = leftPlanBuilder.translate(leftComparisonExpressions.get(i));
                Symbol rightSymbol = rightPlanBuilder.translate(rightComparisonExpressions.get(i));
                equiClauses.add(new JoinNode.EquiJoinClause(leftSymbol, rightSymbol));
            } else {
                Expression leftExpression = leftPlanBuilder.rewrite(leftComparisonExpressions.get(i));
                Expression rightExpression = rightPlanBuilder.rewrite(rightComparisonExpressions.get(i));
                postInnerJoinConditions.add(new ComparisonExpression(joinConditionComparisonTypes.get(i), leftExpression, rightExpression));
            }
        }
    }
    PlanNode root = new JoinNode(idAllocator.getNextId(), JoinNode.Type.typeConvert(node.getType()), leftPlanBuilder.getRoot(), rightPlanBuilder.getRoot(), equiClauses.build(), ImmutableList.<Symbol>builder().addAll(leftPlanBuilder.getRoot().getOutputSymbols()).addAll(rightPlanBuilder.getRoot().getOutputSymbols()).build(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty());
    if (node.getType() != INNER) {
        for (Expression complexExpression : complexJoinExpressions) {
            Set<InPredicate> inPredicates = subqueryPlanner.collectInPredicateSubqueries(complexExpression, node);
            if (!inPredicates.isEmpty()) {
                InPredicate inPredicate = Iterables.getLast(inPredicates);
                throw notSupportedException(inPredicate, "IN with subquery predicate in join condition");
            }
        }
        // subqueries can be applied only to one side of join - left side is selected in arbitrary way
        leftPlanBuilder = subqueryPlanner.handleUncorrelatedSubqueries(leftPlanBuilder, complexJoinExpressions, node);
    }
    RelationPlan intermediateRootRelationPlan = new RelationPlan(root, analysis.getScope(node), outputSymbols);
    TranslationMap translationMap = new TranslationMap(intermediateRootRelationPlan, analysis, lambdaDeclarationToSymbolMap);
    translationMap.setFieldMappings(outputSymbols);
    translationMap.putExpressionMappingsFrom(leftPlanBuilder.getTranslations());
    translationMap.putExpressionMappingsFrom(rightPlanBuilder.getTranslations());
    if (node.getType() != INNER && !complexJoinExpressions.isEmpty()) {
        Expression joinedFilterCondition = ExpressionUtils.and(complexJoinExpressions);
        joinedFilterCondition = ExpressionTreeRewriter.rewriteWith(new ParameterRewriter(analysis.getParameters(), analysis), joinedFilterCondition);
        Expression rewrittenFilterCondition = translationMap.rewrite(joinedFilterCondition);
        root = new JoinNode(idAllocator.getNextId(), JoinNode.Type.typeConvert(node.getType()), leftPlanBuilder.getRoot(), rightPlanBuilder.getRoot(), equiClauses.build(), ImmutableList.<Symbol>builder().addAll(leftPlanBuilder.getRoot().getOutputSymbols()).addAll(rightPlanBuilder.getRoot().getOutputSymbols()).build(), Optional.of(rewrittenFilterCondition), Optional.empty(), Optional.empty(), Optional.empty());
    }
    if (node.getType() == INNER) {
        // rewrite all the other conditions using output symbols from left + right plan node.
        PlanBuilder rootPlanBuilder = new PlanBuilder(translationMap, root, analysis.getParameters());
        rootPlanBuilder = subqueryPlanner.handleSubqueries(rootPlanBuilder, complexJoinExpressions, node);
        for (Expression expression : complexJoinExpressions) {
            expression = ExpressionTreeRewriter.rewriteWith(new ParameterRewriter(analysis.getParameters(), analysis), expression);
            postInnerJoinConditions.add(rootPlanBuilder.rewrite(expression));
        }
        root = rootPlanBuilder.getRoot();
        Expression postInnerJoinCriteria;
        if (!postInnerJoinConditions.isEmpty()) {
            postInnerJoinCriteria = ExpressionUtils.and(postInnerJoinConditions);
            root = new FilterNode(idAllocator.getNextId(), root, postInnerJoinCriteria);
        }
    }
    return new RelationPlan(root, analysis.getScope(node), outputSymbols);
}