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

Example 6 with SymbolReference

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

the class RelationPlanner method addCoercions.

private RelationPlan addCoercions(RelationPlan plan, Type[] targetColumnTypes) {
    List<Symbol> oldSymbols = plan.getFieldMappings();
    RelationType oldDescriptor = plan.getDescriptor().withOnlyVisibleFields();
    verify(targetColumnTypes.length == oldSymbols.size());
    ImmutableList.Builder<Symbol> newSymbols = new ImmutableList.Builder<>();
    Field[] newFields = new Field[targetColumnTypes.length];
    Assignments.Builder assignments = Assignments.builder();
    for (int i = 0; i < targetColumnTypes.length; i++) {
        Symbol inputSymbol = oldSymbols.get(i);
        Type inputType = symbolAllocator.getTypes().get(inputSymbol);
        Type outputType = targetColumnTypes[i];
        if (outputType != inputType && !metadata.getTypeManager().isTypeOnlyCoercion(inputType, outputType)) {
            Expression cast = new Cast(inputSymbol.toSymbolReference(), outputType.getTypeSignature().toString());
            Symbol outputSymbol = symbolAllocator.newSymbol(cast, outputType);
            assignments.put(outputSymbol, cast);
            newSymbols.add(outputSymbol);
        } else {
            SymbolReference symbolReference = inputSymbol.toSymbolReference();
            Symbol outputSymbol = symbolAllocator.newSymbol(symbolReference, outputType);
            assignments.put(outputSymbol, symbolReference);
            newSymbols.add(outputSymbol);
        }
        Field oldField = oldDescriptor.getFieldByIndex(i);
        newFields[i] = new Field(oldField.getRelationAlias(), oldField.getName(), targetColumnTypes[i], oldField.isHidden(), oldField.getOriginTable(), oldField.isAliased());
    }
    ProjectNode projectNode = new ProjectNode(idAllocator.getNextId(), plan.getRoot(), assignments.build());
    return new RelationPlan(projectNode, Scope.builder().withRelationType(new RelationType(newFields)).build(), newSymbols.build());
}

Example 7 with SymbolReference

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

the class SubqueryPlanner method appendInPredicateApplyNode.

private PlanBuilder appendInPredicateApplyNode(PlanBuilder subPlan, InPredicate inPredicate, boolean correlationAllowed) {
    if (subPlan.canTranslate(inPredicate)) {
        // given subquery is already appended
        return subPlan;
    }
    subPlan = subPlan.appendProjections(ImmutableList.of(inPredicate.getValue()), symbolAllocator, idAllocator);
    checkState(inPredicate.getValueList() instanceof SubqueryExpression);
    SubqueryExpression valueListSubquery = (SubqueryExpression) inPredicate.getValueList();
    SubqueryExpression uncoercedValueListSubquery = uncoercedSubquery(valueListSubquery);
    PlanBuilder subqueryPlan = createPlanBuilder(uncoercedValueListSubquery);
    subqueryPlan = subqueryPlan.appendProjections(ImmutableList.of(valueListSubquery), symbolAllocator, idAllocator);
    SymbolReference valueList = subqueryPlan.translate(valueListSubquery).toSymbolReference();
    InPredicate parametersReplaced = ExpressionTreeRewriter.rewriteWith(new ParameterRewriter(parameters, analysis), inPredicate);
    InPredicate inPredicateSubqueryExpression = new InPredicate(subPlan.translate(parametersReplaced.getValue()).toSymbolReference(), valueList);
    Symbol inPredicateSubquerySymbol = symbolAllocator.newSymbol(inPredicateSubqueryExpression, BOOLEAN);
    subPlan.getTranslations().put(parametersReplaced, inPredicateSubquerySymbol);
    subPlan.getTranslations().put(inPredicate, inPredicateSubquerySymbol);
    return appendApplyNode(subPlan, inPredicate, subqueryPlan, Assignments.of(inPredicateSubquerySymbol, inPredicateSubqueryExpression), correlationAllowed);
}

Example 8 with SymbolReference

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

the class QueryPlanner method window.

private PlanBuilder window(PlanBuilder subPlan, QuerySpecification node) {
    List<FunctionCall> windowFunctions = ImmutableList.copyOf(analysis.getWindowFunctions(node));
    if (windowFunctions.isEmpty()) {
        return subPlan;
    }
    for (FunctionCall windowFunction : windowFunctions) {
        Window window = windowFunction.getWindow().get();
        // Extract frame
        WindowFrame.Type frameType = WindowFrame.Type.RANGE;
        FrameBound.Type frameStartType = FrameBound.Type.UNBOUNDED_PRECEDING;
        FrameBound.Type frameEndType = FrameBound.Type.CURRENT_ROW;
        Expression frameStart = null;
        Expression frameEnd = null;
        if (window.getFrame().isPresent()) {
            WindowFrame frame = window.getFrame().get();
            frameType = frame.getType();
            frameStartType = frame.getStart().getType();
            frameStart = frame.getStart().getValue().orElse(null);
            if (frame.getEnd().isPresent()) {
                frameEndType = frame.getEnd().get().getType();
                frameEnd = frame.getEnd().get().getValue().orElse(null);
            }
        }
        // Pre-project inputs
        ImmutableList.Builder<Expression> inputs = ImmutableList.<Expression>builder().addAll(windowFunction.getArguments()).addAll(window.getPartitionBy()).addAll(Iterables.transform(window.getOrderBy(), SortItem::getSortKey));
        if (frameStart != null) {
            inputs.add(frameStart);
        }
        if (frameEnd != null) {
            inputs.add(frameEnd);
        }
        subPlan = subPlan.appendProjections(inputs.build(), symbolAllocator, idAllocator);
        // Rewrite PARTITION BY in terms of pre-projected inputs
        ImmutableList.Builder<Symbol> partitionBySymbols = ImmutableList.builder();
        for (Expression expression : window.getPartitionBy()) {
            partitionBySymbols.add(subPlan.translate(expression));
        }
        // Rewrite ORDER BY in terms of pre-projected inputs
        Map<Symbol, SortOrder> orderings = new LinkedHashMap<>();
        for (SortItem item : window.getOrderBy()) {
            Symbol symbol = subPlan.translate(item.getSortKey());
            orderings.put(symbol, toSortOrder(item));
        }
        // Rewrite frame bounds in terms of pre-projected inputs
        Optional<Symbol> frameStartSymbol = Optional.empty();
        Optional<Symbol> frameEndSymbol = Optional.empty();
        if (frameStart != null) {
            frameStartSymbol = Optional.of(subPlan.translate(frameStart));
        }
        if (frameEnd != null) {
            frameEndSymbol = Optional.of(subPlan.translate(frameEnd));
        }
        WindowNode.Frame frame = new WindowNode.Frame(frameType, frameStartType, frameStartSymbol, frameEndType, frameEndSymbol);
        TranslationMap outputTranslations = subPlan.copyTranslations();
        // Rewrite function call in terms of pre-projected inputs
        Expression parametersReplaced = ExpressionTreeRewriter.rewriteWith(new ParameterRewriter(analysis.getParameters(), analysis), windowFunction);
        outputTranslations.addIntermediateMapping(windowFunction, parametersReplaced);
        Expression rewritten = subPlan.rewrite(parametersReplaced);
        boolean needCoercion = rewritten instanceof Cast;
        // Strip out the cast and add it back as a post-projection
        if (rewritten instanceof Cast) {
            rewritten = ((Cast) rewritten).getExpression();
        }
        // If refers to existing symbol, don't create another PlanNode
        if (rewritten instanceof SymbolReference) {
            if (needCoercion) {
                subPlan = explicitCoercionSymbols(subPlan, subPlan.getRoot().getOutputSymbols(), ImmutableList.of(windowFunction));
            }
            continue;
        }
        Symbol newSymbol = symbolAllocator.newSymbol(rewritten, analysis.getType(windowFunction));
        outputTranslations.put(parametersReplaced, newSymbol);
        WindowNode.Function function = new WindowNode.Function((FunctionCall) rewritten, analysis.getFunctionSignature(windowFunction), frame);
        List<Symbol> sourceSymbols = subPlan.getRoot().getOutputSymbols();
        ImmutableList.Builder<Symbol> orderBySymbols = ImmutableList.builder();
        orderBySymbols.addAll(orderings.keySet());
        // create window node
        subPlan = new PlanBuilder(outputTranslations, new WindowNode(idAllocator.getNextId(), subPlan.getRoot(), new WindowNode.Specification(partitionBySymbols.build(), orderBySymbols.build(), orderings), ImmutableMap.of(newSymbol, function), Optional.empty(), ImmutableSet.of(), 0), analysis.getParameters());
        if (needCoercion) {
            subPlan = explicitCoercionSymbols(subPlan, sourceSymbols, ImmutableList.of(windowFunction));
        }
    }
    return subPlan;
}

Example 9 with SymbolReference

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

the class DomainTranslator method toPredicate.

private static Expression toPredicate(Domain domain, SymbolReference reference) {
    if (domain.getValues().isNone()) {
        return domain.isNullAllowed() ? new IsNullPredicate(reference) : FALSE_LITERAL;
    }
    if (domain.getValues().isAll()) {
        return domain.isNullAllowed() ? TRUE_LITERAL : new NotExpression(new IsNullPredicate(reference));
    }
    List<Expression> disjuncts = new ArrayList<>();
    disjuncts.addAll(domain.getValues().getValuesProcessor().transform(ranges -> extractDisjuncts(domain.getType(), ranges, reference), discreteValues -> extractDisjuncts(domain.getType(), discreteValues, reference), allOrNone -> {
        throw new IllegalStateException("Case should not be reachable");
    }));
    // Add nullability disjuncts
    if (domain.isNullAllowed()) {
        disjuncts.add(new IsNullPredicate(reference));
    }
    return combineDisjunctsWithDefault(disjuncts, TRUE_LITERAL);
}

Example 10 with SymbolReference

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

the class TestEliminateCrossJoins method testGiveUpOnNonIdentityProjections.

@Test
public void testGiveUpOnNonIdentityProjections() {
    PlanNode plan = join(project(join(values(symbol("a1")), values(symbol("b"))), symbol("a2"), new ArithmeticUnaryExpression(MINUS, new SymbolReference("a1"))), values(symbol("c")), symbol("a2"), symbol("c"), symbol("c"), symbol("b"));
    assertEquals(JoinGraph.buildFrom(plan).size(), 2);
}