Examples with PlanNodeDecorrelator io.prestosql.sql.planner.optimizations.PlanNodeDecorrelator used on opensource projects

Example 1 with PlanNodeDecorrelator

use of io.prestosql.sql.planner.optimizations.PlanNodeDecorrelator in project hetu-core by openlookeng.

the class TransformCorrelatedLateralJoinToJoin method apply.

@Override
public Result apply(LateralJoinNode lateralJoinNode, Captures captures, Context context) {
    PlanNode subquery = lateralJoinNode.getSubquery();
    PlanNodeDecorrelator planNodeDecorrelator = new PlanNodeDecorrelator(context.getIdAllocator(), context.getLookup());
    Optional<DecorrelatedNode> decorrelatedNodeOptional = planNodeDecorrelator.decorrelateFilters(subquery, lateralJoinNode.getCorrelation());
    return decorrelatedNodeOptional.map(decorrelatedNode -> {
        Expression joinFilter = combineConjuncts(decorrelatedNode.getCorrelatedPredicates().orElse(TRUE_LITERAL), lateralJoinNode.getFilter());
        return Result.ofPlanNode(new JoinNode(context.getIdAllocator().getNextId(), lateralJoinNode.getType().toJoinNodeType(), lateralJoinNode.getInput(), decorrelatedNode.getNode(), ImmutableList.of(), lateralJoinNode.getOutputSymbols(), joinFilter.equals(TRUE_LITERAL) ? Optional.empty() : Optional.of(castToRowExpression(joinFilter)), Optional.empty(), Optional.empty(), Optional.empty(), Optional.empty(), ImmutableMap.of()));
    }).orElseGet(Result::empty);
}

Example 2 with PlanNodeDecorrelator

use of io.prestosql.sql.planner.optimizations.PlanNodeDecorrelator in project hetu-core by openlookeng.

the class TransformExistsApplyToLateralNode method rewriteToNonDefaultAggregation.

private Optional<PlanNode> rewriteToNonDefaultAggregation(ApplyNode applyNode, Context context) {
    checkState(applyNode.getSubquery().getOutputSymbols().isEmpty(), "Expected subquery output symbols to be pruned");
    Symbol exists = getOnlyElement(applyNode.getSubqueryAssignments().getSymbols());
    Symbol subqueryTrue = context.getSymbolAllocator().newSymbol("subqueryTrue", BOOLEAN);
    Assignments.Builder assignments = Assignments.builder();
    assignments.putAll(AssignmentUtils.identityAsSymbolReferences(applyNode.getInput().getOutputSymbols()));
    assignments.put(exists, castToRowExpression(new CoalesceExpression(ImmutableList.of(toSymbolReference(subqueryTrue), BooleanLiteral.FALSE_LITERAL))));
    PlanNode subquery = new ProjectNode(context.getIdAllocator().getNextId(), new LimitNode(context.getIdAllocator().getNextId(), applyNode.getSubquery(), 1L, false), Assignments.of(subqueryTrue, castToRowExpression(TRUE_LITERAL)));
    PlanNodeDecorrelator decorrelator = new PlanNodeDecorrelator(context.getIdAllocator(), context.getLookup());
    if (!decorrelator.decorrelateFilters(subquery, applyNode.getCorrelation()).isPresent()) {
        return Optional.empty();
    }
    return Optional.of(new ProjectNode(context.getIdAllocator().getNextId(), new LateralJoinNode(applyNode.getId(), applyNode.getInput(), subquery, applyNode.getCorrelation(), LEFT, TRUE_LITERAL, applyNode.getOriginSubquery()), assignments.build()));
}