Examples with AsyncFlatMapBatchIterator io.crate.data.AsyncFlatMapBatchIterator used on opensource projects

Example 1 with AsyncFlatMapBatchIterator

use of io.crate.data.AsyncFlatMapBatchIterator in project crate by crate.

the class FetchProjector method create.

public static Projector create(FetchProjection projection, RamAccounting ramAccounting, LongSupplier getBucketsBytesThreshold, TransactionContext txnCtx, NodeContext nodeCtx, FetchOperation fetchOperation) {
    final FetchRows fetchRows = FetchRows.create(txnCtx, nodeCtx, projection.fetchSources(), projection.outputSymbols());
    EstimateCellsSize estimateRowSize = new EstimateCellsSize(projection.inputTypes());
    return (BatchIterator<Row> source) -> {
        final long maxBucketsSizeInBytes = getBucketsBytesThreshold.getAsLong();
        BatchIterator<ReaderBuckets> buckets = BatchIterators.partition(source, projection.getFetchSize(), () -> new ReaderBuckets(fetchRows, projection::getFetchSourceByReader, estimateRowSize, ramAccounting), ReaderBuckets::add, readerBuckets -> readerBuckets.ramBytesUsed() > maxBucketsSizeInBytes);
        return new AsyncFlatMapBatchIterator<>(buckets, new FetchMapper(fetchOperation, projection.nodeReaders()));
    };
}