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

Example 16 with QualifiedName

use of com.facebook.presto.sql.tree.QualifiedName 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);
    Optional<Unnest> unnest = getUnnest(node.getRight());
    if (unnest.isPresent()) {
        if (node.getType() != Join.Type.CROSS && node.getType() != Join.Type.IMPLICIT) {
            throw notSupportedException(unnest.get(), "UNNEST on other than the right side of CROSS JOIN");
        }
        return planCrossJoinUnnest(leftPlan, node, unnest.get());
    }
    Optional<Lateral> lateral = getLateral(node.getRight());
    if (lateral.isPresent()) {
        if (node.getType() != Join.Type.CROSS && node.getType() != Join.Type.IMPLICIT) {
            throw notSupportedException(lateral.get(), "LATERAL on other than the right side of CROSS JOIN");
        }
        return planLateralJoin(node, leftPlan, lateral.get());
    }
    RelationPlan rightPlan = process(node.getRight(), context);
    if (node.getCriteria().isPresent() && node.getCriteria().get() instanceof JoinUsing) {
        return planJoinUsing(node, leftPlan, rightPlan);
    }
    PlanBuilder leftPlanBuilder = initializePlanBuilder(leftPlan);
    PlanBuilder rightPlanBuilder = initializePlanBuilder(rightPlan);
    // NOTE: variables must be in the same order as the outputDescriptor
    List<VariableReferenceExpression> outputs = ImmutableList.<VariableReferenceExpression>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<ComparisonExpression.Operator> joinConditionComparisonOperators = 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 = VariablesExtractor.extractNames(conjunct, analysis.getColumnReferences());
            if (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.
                complexJoinExpressions.add(conjunct);
            } else if (conjunct instanceof ComparisonExpression) {
                Expression firstExpression = ((ComparisonExpression) conjunct).getLeft();
                Expression secondExpression = ((ComparisonExpression) conjunct).getRight();
                ComparisonExpression.Operator comparisonOperator = ((ComparisonExpression) conjunct).getOperator();
                Set<QualifiedName> firstDependencies = VariablesExtractor.extractNames(firstExpression, analysis.getColumnReferences());
                Set<QualifiedName> secondDependencies = VariablesExtractor.extractNames(secondExpression, analysis.getColumnReferences());
                if (firstDependencies.stream().allMatch(left::canResolve) && secondDependencies.stream().allMatch(right::canResolve)) {
                    leftComparisonExpressions.add(firstExpression);
                    rightComparisonExpressions.add(secondExpression);
                    addNullFilters(complexJoinExpressions, node.getType(), firstExpression, secondExpression);
                    joinConditionComparisonOperators.add(comparisonOperator);
                } else if (firstDependencies.stream().allMatch(right::canResolve) && secondDependencies.stream().allMatch(left::canResolve)) {
                    leftComparisonExpressions.add(secondExpression);
                    rightComparisonExpressions.add(firstExpression);
                    addNullFilters(complexJoinExpressions, node.getType(), secondExpression, firstExpression);
                    joinConditionComparisonOperators.add(comparisonOperator.flip());
                } else {
                    // the case when we mix variables 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, variableAllocator, idAllocator);
        rightPlanBuilder = rightPlanBuilder.appendProjections(rightComparisonExpressions, variableAllocator, idAllocator);
        for (int i = 0; i < leftComparisonExpressions.size(); i++) {
            if (joinConditionComparisonOperators.get(i) == ComparisonExpression.Operator.EQUAL) {
                VariableReferenceExpression leftVariable = leftPlanBuilder.translateToVariable(leftComparisonExpressions.get(i));
                VariableReferenceExpression righVariable = rightPlanBuilder.translateToVariable(rightComparisonExpressions.get(i));
                equiClauses.add(new JoinNode.EquiJoinClause(leftVariable, righVariable));
            } else {
                Expression leftExpression = leftPlanBuilder.rewrite(leftComparisonExpressions.get(i));
                Expression rightExpression = rightPlanBuilder.rewrite(rightComparisonExpressions.get(i));
                postInnerJoinConditions.add(new ComparisonExpression(joinConditionComparisonOperators.get(i), leftExpression, rightExpression));
            }
        }
    }
    PlanNode root = new JoinNode(getSourceLocation(node), idAllocator.getNextId(), JoinNodeUtils.typeConvert(node.getType()), leftPlanBuilder.getRoot(), rightPlanBuilder.getRoot(), equiClauses.build(), ImmutableList.<VariableReferenceExpression>builder().addAll(leftPlanBuilder.getRoot().getOutputVariables()).addAll(rightPlanBuilder.getRoot().getOutputVariables()).build(), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), ImmutableMap.of());
    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), outputs);
    TranslationMap translationMap = new TranslationMap(intermediateRootRelationPlan, analysis, lambdaDeclarationToVariableMap);
    translationMap.setFieldMappings(outputs);
    translationMap.putExpressionMappingsFrom(leftPlanBuilder.getTranslations());
    translationMap.putExpressionMappingsFrom(rightPlanBuilder.getTranslations());
    if (node.getType() != INNER && !complexJoinExpressions.isEmpty()) {
        Expression joinedFilterCondition = ExpressionUtils.and(complexJoinExpressions);
        Expression rewrittenFilterCondition = translationMap.rewrite(joinedFilterCondition);
        root = new JoinNode(getSourceLocation(node), idAllocator.getNextId(), JoinNodeUtils.typeConvert(node.getType()), leftPlanBuilder.getRoot(), rightPlanBuilder.getRoot(), equiClauses.build(), ImmutableList.<VariableReferenceExpression>builder().addAll(leftPlanBuilder.getRoot().getOutputVariables()).addAll(rightPlanBuilder.getRoot().getOutputVariables()).build(), Optional.of(castToRowExpression(rewrittenFilterCondition)), Optional.empty(), Optional.empty(), Optional.empty(), ImmutableMap.of());
    }
    if (node.getType() == INNER) {
        // rewrite all the other conditions using output variables from left + right plan node.
        PlanBuilder rootPlanBuilder = new PlanBuilder(translationMap, root);
        rootPlanBuilder = subqueryPlanner.handleSubqueries(rootPlanBuilder, complexJoinExpressions, node);
        for (Expression expression : complexJoinExpressions) {
            postInnerJoinConditions.add(rootPlanBuilder.rewrite(expression));
        }
        root = rootPlanBuilder.getRoot();
        Expression postInnerJoinCriteria;
        if (!postInnerJoinConditions.isEmpty()) {
            postInnerJoinCriteria = ExpressionUtils.and(postInnerJoinConditions);
            root = new FilterNode(getSourceLocation(postInnerJoinCriteria), idAllocator.getNextId(), root, castToRowExpression(postInnerJoinCriteria));
        }
    }
    return new RelationPlan(root, analysis.getScope(node), outputs);
}

Example 17 with QualifiedName

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

the class QueryRewriter method rewriteQuery.

public QueryObjectBundle rewriteQuery(@Language("SQL") String query, ClusterType clusterType) {
    checkState(prefixes.containsKey(clusterType), "Unsupported cluster type: %s", clusterType);
    Statement statement = sqlParser.createStatement(query, PARSING_OPTIONS);
    QualifiedName prefix = prefixes.get(clusterType);
    List<Property> properties = tableProperties.get(clusterType);
    if (statement instanceof CreateTableAsSelect) {
        CreateTableAsSelect createTableAsSelect = (CreateTableAsSelect) statement;
        QualifiedName temporaryTableName = generateTemporaryName(Optional.of(createTableAsSelect.getName()), prefix);
        return new QueryObjectBundle(temporaryTableName, ImmutableList.of(), new CreateTableAsSelect(temporaryTableName, createTableAsSelect.getQuery(), createTableAsSelect.isNotExists(), applyPropertyOverride(createTableAsSelect.getProperties(), properties), createTableAsSelect.isWithData(), createTableAsSelect.getColumnAliases(), createTableAsSelect.getComment()), ImmutableList.of(new DropTable(temporaryTableName, true)), clusterType);
    }
    if (statement instanceof Insert) {
        Insert insert = (Insert) statement;
        QualifiedName originalTableName = insert.getTarget();
        QualifiedName temporaryTableName = generateTemporaryName(Optional.of(originalTableName), prefix);
        return new QueryObjectBundle(temporaryTableName, ImmutableList.of(new CreateTable(temporaryTableName, ImmutableList.of(new LikeClause(originalTableName, Optional.of(INCLUDING))), false, properties, Optional.empty())), new Insert(temporaryTableName, insert.getColumns(), insert.getQuery()), ImmutableList.of(new DropTable(temporaryTableName, true)), clusterType);
    }
    if (statement instanceof Query) {
        QualifiedName temporaryTableName = generateTemporaryName(Optional.empty(), prefix);
        ResultSetMetaData metadata = getResultMetadata((Query) statement);
        List<Identifier> columnAliases = generateStorageColumnAliases(metadata);
        Query rewrite = rewriteNonStorableColumns((Query) statement, metadata);
        return new QueryObjectBundle(temporaryTableName, ImmutableList.of(), new CreateTableAsSelect(temporaryTableName, rewrite, false, properties, true, Optional.of(columnAliases), Optional.empty()), ImmutableList.of(new DropTable(temporaryTableName, true)), clusterType);
    }
    if (statement instanceof CreateView) {
        CreateView createView = (CreateView) statement;
        QualifiedName temporaryViewName = generateTemporaryName(Optional.empty(), prefix);
        ImmutableList.Builder<Statement> setupQueries = ImmutableList.builder();
        // Otherwise, do not pre-create temporary view.
        try {
            String createExistingViewQuery = getOnlyElement(prestoAction.execute(new ShowCreate(VIEW, createView.getName()), REWRITE, SHOW_CREATE_VIEW_CONVERTER).getResults());
            CreateView createExistingView = (CreateView) sqlParser.createStatement(createExistingViewQuery, PARSING_OPTIONS);
            setupQueries.add(new CreateView(temporaryViewName, createExistingView.getQuery(), false, createExistingView.getSecurity()));
        } catch (QueryException e) {
        // no-op
        }
        return new QueryObjectBundle(temporaryViewName, setupQueries.build(), new CreateView(temporaryViewName, createView.getQuery(), createView.isReplace(), createView.getSecurity()), ImmutableList.of(new DropView(temporaryViewName, true)), clusterType);
    }
    if (statement instanceof CreateTable) {
        CreateTable createTable = (CreateTable) statement;
        QualifiedName temporaryTableName = generateTemporaryName(Optional.empty(), prefix);
        return new QueryObjectBundle(temporaryTableName, ImmutableList.of(), new CreateTable(temporaryTableName, createTable.getElements(), createTable.isNotExists(), applyPropertyOverride(createTable.getProperties(), properties), createTable.getComment()), ImmutableList.of(new DropTable(temporaryTableName, true)), clusterType);
    }
    throw new IllegalStateException(format("Unsupported query type: %s", statement.getClass()));
}