Examples with ExchangeNode com.facebook.presto.sql.planner.plan.ExchangeNode used on opensource projects

Example 1 with ExchangeNode

use of com.facebook.presto.sql.planner.plan.ExchangeNode in project presto by prestodb.

the class RemoveEmptyDelete method apply.

@Override
public Optional<PlanNode> apply(PlanNode node, Lookup lookup, PlanNodeIdAllocator idAllocator, SymbolAllocator symbolAllocator) {
    if (!(node instanceof TableFinishNode)) {
        return Optional.empty();
    }
    TableFinishNode finish = (TableFinishNode) node;
    PlanNode finishSource = lookup.resolve(finish.getSource());
    if (!(finishSource instanceof ExchangeNode)) {
        return Optional.empty();
    }
    ExchangeNode exchange = (ExchangeNode) finishSource;
    if (exchange.getSources().size() != 1) {
        return Optional.empty();
    }
    PlanNode exchangeSource = lookup.resolve(getOnlyElement(exchange.getSources()));
    if (!(exchangeSource instanceof DeleteNode)) {
        return Optional.empty();
    }
    DeleteNode delete = (DeleteNode) exchangeSource;
    PlanNode deleteSource = lookup.resolve(delete.getSource());
    if (!(deleteSource instanceof ValuesNode)) {
        return Optional.empty();
    }
    ValuesNode values = (ValuesNode) deleteSource;
    if (!values.getRows().isEmpty()) {
        return Optional.empty();
    }
    return Optional.of(new ValuesNode(node.getId(), node.getOutputSymbols(), ImmutableList.of(ImmutableList.of(new LongLiteral("0")))));
}