Examples with Symbol io.prestosql.spi.plan.Symbol used on opensource projects

Example 76 with Symbol

use of io.prestosql.spi.plan.Symbol in project hetu-core by openlookeng.

the class QueryPlanner method project.

private PlanBuilder project(PlanBuilder subPlan, Iterable<Expression> expressions) {
    TranslationMap outputTranslations = new TranslationMap(subPlan.getRelationPlan(), analysis, lambdaDeclarationToSymbolMap);
    Assignments.Builder projections = Assignments.builder();
    for (Expression expression : expressions) {
        if (expression instanceof SymbolReference) {
            Symbol symbol = from(expression);
            projections.put(symbol, castToRowExpression(expression));
            outputTranslations.put(expression, symbol);
            continue;
        }
        Symbol symbol = planSymbolAllocator.newSymbol(expression, analysis.getTypeWithCoercions(expression));
        projections.put(symbol, castToRowExpression(subPlan.rewrite(expression)));
        outputTranslations.put(expression, symbol);
    }
    return new PlanBuilder(outputTranslations, new ProjectNode(idAllocator.getNextId(), subPlan.getRoot(), projections.build()));
}

Example 77 with Symbol

use of io.prestosql.spi.plan.Symbol in project hetu-core by openlookeng.

the class QueryPlanner method handleGroupingOperations.

private PlanBuilder handleGroupingOperations(PlanBuilder subPlan, QuerySpecification node, Optional<Symbol> groupIdSymbol, List<Set<FieldId>> groupingSets) {
    if (analysis.getGroupingOperations(node).isEmpty()) {
        return subPlan;
    }
    TranslationMap newTranslations = subPlan.copyTranslations();
    Assignments.Builder projections = Assignments.builder();
    projections.putAll(AssignmentUtils.identityAsSymbolReferences(subPlan.getRoot().getOutputSymbols()));
    List<Set<Integer>> descriptor = groupingSets.stream().map(set -> set.stream().map(FieldId::getFieldIndex).collect(toImmutableSet())).collect(toImmutableList());
    for (GroupingOperation groupingOperation : analysis.getGroupingOperations(node)) {
        Expression rewritten = GroupingOperationRewriter.rewriteGroupingOperation(groupingOperation, descriptor, analysis.getColumnReferenceFields(), groupIdSymbol);
        Type coercion = analysis.getCoercion(groupingOperation);
        Symbol symbol = planSymbolAllocator.newSymbol(rewritten, analysis.getTypeWithCoercions(groupingOperation));
        if (coercion != null) {
            rewritten = new Cast(rewritten, coercion.getTypeSignature().toString(), false, typeCoercion.isTypeOnlyCoercion(analysis.getType(groupingOperation), coercion));
        }
        projections.put(symbol, castToRowExpression(rewritten));
        newTranslations.put(groupingOperation, symbol);
    }
    return new PlanBuilder(newTranslations, new ProjectNode(idAllocator.getNextId(), subPlan.getRoot(), projections.build()));
}

Example 78 with Symbol

use of io.prestosql.spi.plan.Symbol in project hetu-core by openlookeng.

the class QueryPlanner method plan.

public DeleteNode plan(Delete node) {
    Table table = node.getTable();
    TableHandle handle = analysis.getTableHandle(table);
    RelationPlan relationPlan = new RelationPlanner(analysis, planSymbolAllocator, idAllocator, lambdaDeclarationToSymbolMap, metadata, session, namedSubPlan, uniqueIdAllocator).process(table, null);
    PlanBuilder builder = planBuilderFor(relationPlan);
    if (node.getWhere().isPresent()) {
        builder = filter(builder, node.getWhere().get(), node);
    }
    // create delete node
    Symbol rowId = builder.translate(analysis.getRowIdField(table));
    List<Symbol> outputs = ImmutableList.of(planSymbolAllocator.newSymbol("partialrows", BIGINT), planSymbolAllocator.newSymbol("fragment", VARBINARY));
    return new DeleteNode(idAllocator.getNextId(), builder.getRoot(), new DeleteTarget(handle, metadata.getTableMetadata(session, handle).getTable()), rowId, outputs);
}

Example 79 with Symbol

use of io.prestosql.spi.plan.Symbol in project hetu-core by openlookeng.

the class QueryPlanner method aggregate.

private PlanBuilder aggregate(PlanBuilder inputSubPlan, QuerySpecification node) {
    PlanBuilder subPlan = inputSubPlan;
    if (!analysis.isAggregation(node)) {
        return subPlan;
    }
    // 1. Pre-project all scalar inputs (arguments and non-trivial group by expressions)
    Set<Expression> groupByExpressions = ImmutableSet.copyOf(analysis.getGroupByExpressions(node));
    ImmutableList.Builder<Expression> arguments = ImmutableList.builder();
    analysis.getAggregates(node).stream().map(FunctionCall::getArguments).flatMap(List::stream).filter(// lambda expression is generated at execution time
    exp -> !(exp instanceof LambdaExpression)).forEach(arguments::add);
    analysis.getAggregates(node).stream().map(FunctionCall::getOrderBy).filter(Optional::isPresent).map(Optional::get).map(OrderBy::getSortItems).flatMap(List::stream).map(SortItem::getSortKey).forEach(arguments::add);
    // filter expressions need to be projected first
    analysis.getAggregates(node).stream().map(FunctionCall::getFilter).filter(Optional::isPresent).map(Optional::get).forEach(arguments::add);
    Iterable<Expression> inputs = Iterables.concat(groupByExpressions, arguments.build());
    subPlan = handleSubqueries(subPlan, node, inputs);
    if (!Iterables.isEmpty(inputs)) {
        // avoid an empty projection if the only aggregation is COUNT (which has no arguments)
        subPlan = project(subPlan, inputs);
    }
    // 2. Aggregate
    // 2.a. Rewrite aggregate arguments
    TranslationMap argumentTranslations = new TranslationMap(subPlan.getRelationPlan(), analysis, lambdaDeclarationToSymbolMap);
    ImmutableList.Builder<Symbol> aggregationArgumentsBuilder = ImmutableList.builder();
    for (Expression argument : arguments.build()) {
        Symbol symbol = subPlan.translate(argument);
        argumentTranslations.put(argument, symbol);
        aggregationArgumentsBuilder.add(symbol);
    }
    List<Symbol> aggregationArguments = aggregationArgumentsBuilder.build();
    // 2.b. Rewrite grouping columns
    TranslationMap groupingTranslations = new TranslationMap(subPlan.getRelationPlan(), analysis, lambdaDeclarationToSymbolMap);
    Map<Symbol, Symbol> groupingSetMappings = new LinkedHashMap<>();
    for (Expression expression : groupByExpressions) {
        Symbol input = subPlan.translate(expression);
        Symbol output = planSymbolAllocator.newSymbol(expression, analysis.getTypeWithCoercions(expression), "gid");
        groupingTranslations.put(expression, output);
        groupingSetMappings.put(output, input);
    }
    // This tracks the grouping sets before complex expressions are considered (see comments below)
    // It's also used to compute the descriptors needed to implement grouping()
    List<Set<FieldId>> columnOnlyGroupingSets = ImmutableList.of(ImmutableSet.of());
    List<List<Symbol>> groupingSets = ImmutableList.of(ImmutableList.of());
    if (node.getGroupBy().isPresent()) {
        // For the purpose of "distinct", we need to canonicalize column references that may have varying
        // syntactic forms (e.g., "t.a" vs "a"). Thus we need to enumerate grouping sets based on the underlying
        // fieldId associated with each column reference expression.
        // The catch is that simple group-by expressions can be arbitrary expressions (this is a departure from the SQL specification).
        // But, they don't affect the number of grouping sets or the behavior of "distinct" . We can compute all the candidate
        // grouping sets in terms of fieldId, dedup as appropriate and then cross-join them with the complex expressions.
        Analysis.GroupingSetAnalysis groupingSetAnalysis = analysis.getGroupingSets(node);
        columnOnlyGroupingSets = enumerateGroupingSets(groupingSetAnalysis);
        if (node.getGroupBy().get().isDistinct()) {
            columnOnlyGroupingSets = columnOnlyGroupingSets.stream().distinct().collect(toImmutableList());
        }
        // add in the complex expressions an turn materialize the grouping sets in terms of plan columns
        ImmutableList.Builder<List<Symbol>> groupingSetBuilder = ImmutableList.builder();
        for (Set<FieldId> groupingSet : columnOnlyGroupingSets) {
            ImmutableList.Builder<Symbol> columns = ImmutableList.builder();
            groupingSetAnalysis.getComplexExpressions().stream().map(groupingTranslations::get).forEach(columns::add);
            groupingSet.stream().map(field -> groupingTranslations.get(new FieldReference(field.getFieldIndex()))).forEach(columns::add);
            groupingSetBuilder.add(columns.build());
        }
        groupingSets = groupingSetBuilder.build();
    }
    // 2.c. Generate GroupIdNode (multiple grouping sets) or ProjectNode (single grouping set)
    Optional<Symbol> groupIdSymbol = Optional.empty();
    if (groupingSets.size() > 1) {
        groupIdSymbol = Optional.of(planSymbolAllocator.newSymbol("groupId", BIGINT));
        GroupIdNode groupId = new GroupIdNode(idAllocator.getNextId(), subPlan.getRoot(), groupingSets, groupingSetMappings, aggregationArguments, groupIdSymbol.get());
        subPlan = new PlanBuilder(groupingTranslations, groupId);
    } else {
        Assignments.Builder assignments = Assignments.builder();
        aggregationArguments.forEach(symbol -> assignments.put(symbol, castToRowExpression(toSymbolReference(symbol))));
        groupingSetMappings.forEach((key, value) -> assignments.put(key, castToRowExpression(toSymbolReference(value))));
        ProjectNode project = new ProjectNode(idAllocator.getNextId(), subPlan.getRoot(), assignments.build());
        subPlan = new PlanBuilder(groupingTranslations, project);
    }
    TranslationMap aggregationTranslations = new TranslationMap(subPlan.getRelationPlan(), analysis, lambdaDeclarationToSymbolMap);
    aggregationTranslations.copyMappingsFrom(groupingTranslations);
    // 2.d. Rewrite aggregates
    ImmutableMap.Builder<Symbol, Aggregation> aggregationsBuilder = ImmutableMap.builder();
    boolean needPostProjectionCoercion = false;
    for (FunctionCall aggregate : analysis.getAggregates(node)) {
        Expression rewritten = argumentTranslations.rewrite(aggregate);
        Symbol newSymbol = planSymbolAllocator.newSymbol(rewritten, analysis.getType(aggregate));
        // Therefore we can end up with this implicit cast, and have to move it into a post-projection
        if (rewritten instanceof Cast) {
            rewritten = ((Cast) rewritten).getExpression();
            needPostProjectionCoercion = true;
        }
        aggregationTranslations.put(aggregate, newSymbol);
        FunctionCall functionCall = (FunctionCall) rewritten;
        aggregationsBuilder.put(newSymbol, new Aggregation(call(aggregate.getName().getSuffix(), analysis.getFunctionHandle(aggregate), analysis.getType(aggregate), functionCall.getArguments().stream().map(OriginalExpressionUtils::castToRowExpression).collect(toImmutableList())), functionCall.getArguments().stream().map(OriginalExpressionUtils::castToRowExpression).collect(toImmutableList()), functionCall.isDistinct(), functionCall.getFilter().map(SymbolUtils::from), functionCall.getOrderBy().map(OrderingSchemeUtils::fromOrderBy), Optional.empty()));
    }
    Map<Symbol, Aggregation> aggregations = aggregationsBuilder.build();
    ImmutableSet.Builder<Integer> globalGroupingSets = ImmutableSet.builder();
    for (int i = 0; i < groupingSets.size(); i++) {
        if (groupingSets.get(i).isEmpty()) {
            globalGroupingSets.add(i);
        }
    }
    ImmutableList.Builder<Symbol> groupingKeys = ImmutableList.builder();
    groupingSets.stream().flatMap(List::stream).distinct().forEach(groupingKeys::add);
    groupIdSymbol.ifPresent(groupingKeys::add);
    AggregationNode aggregationNode = new AggregationNode(idAllocator.getNextId(), subPlan.getRoot(), aggregations, groupingSets(groupingKeys.build(), groupingSets.size(), globalGroupingSets.build()), ImmutableList.of(), AggregationNode.Step.SINGLE, Optional.empty(), groupIdSymbol, AggregationNode.AggregationType.HASH, Optional.empty());
    subPlan = new PlanBuilder(aggregationTranslations, aggregationNode);
    // TODO: this is a hack, we should change type coercions to coerce the inputs to functions/operators instead of coercing the output
    if (needPostProjectionCoercion) {
        ImmutableList.Builder<Expression> alreadyCoerced = ImmutableList.builder();
        alreadyCoerced.addAll(groupByExpressions);
        groupIdSymbol.map(SymbolUtils::toSymbolReference).ifPresent(alreadyCoerced::add);
        subPlan = explicitCoercionFields(subPlan, alreadyCoerced.build(), analysis.getAggregates(node));
    }
    // 4. Project and re-write all grouping functions
    return handleGroupingOperations(subPlan, node, groupIdSymbol, columnOnlyGroupingSets);
}

Example 80 with Symbol

use of io.prestosql.spi.plan.Symbol in project hetu-core by openlookeng.

the class QueryPlanner method coerce.

/**
 * Creates a projection with any additional coercions by identity of the provided expressions.
 *
 * @return the new subplan and a mapping of each expression to the symbol representing the coercion or an existing symbol if a coercion wasn't needed
 */
public static PlanAndMappings coerce(PlanBuilder inputSubPlan, List<Expression> expressions, Analysis analysis, PlanNodeIdAllocator idAllocator, PlanSymbolAllocator planSymbolAllocator, TypeCoercion typeCoercion) {
    PlanBuilder subPlan = inputSubPlan;
    Assignments.Builder assignments = Assignments.builder();
    assignments.putAll(AssignmentUtils.identityAsSymbolReferences(subPlan.getRoot().getOutputSymbols()));
    ImmutableMap.Builder<NodeRef<Expression>, Symbol> mappings = ImmutableMap.builder();
    for (Expression expression : expressions) {
        Type coercion = analysis.getCoercion(expression);
        if (coercion != null) {
            Type type = analysis.getType(expression);
            Symbol symbol = planSymbolAllocator.newSymbol(expression, coercion);
            assignments.put(symbol, castToRowExpression(new Cast(subPlan.rewrite(expression), coercion.getTypeSignature().toString(), false, typeCoercion.isTypeOnlyCoercion(type, coercion))));
            mappings.put(NodeRef.of(expression), symbol);
        } else {
            mappings.put(NodeRef.of(expression), subPlan.translate(expression));
        }
    }
    subPlan = subPlan.withNewRoot(new ProjectNode(idAllocator.getNextId(), subPlan.getRoot(), assignments.build()));
    return new PlanAndMappings(subPlan, mappings.build());
}