Examples with LazyBlock com.facebook.presto.common.block.LazyBlock used on opensource projects

Example 11 with LazyBlock

use of com.facebook.presto.common.block.LazyBlock in project presto by prestodb.

the class OrcPageSource method getNextPage.

@Override
public Page getNextPage() {
    try {
        batchId++;
        int batchSize = recordReader.nextBatch();
        if (batchSize <= 0) {
            close();
            return null;
        }
        completedPositions += batchSize;
        long filePosition = recordReader.getFilePosition();
        // for every page, will generate its rowsToKeep
        RowsToKeepResult rowsToKeep = deltaShardLoader.getRowsToKeep(batchSize, filePosition);
        Block[] blocks = new Block[columnIndexes.length];
        for (int fieldId = 0; fieldId < blocks.length; fieldId++) {
            if (constantBlocks[fieldId] != null) {
                blocks[fieldId] = constantBlocks[fieldId].getRegion(0, rowsToKeep.keepAll() ? batchSize : rowsToKeep.size());
            } else if (columnIndexes[fieldId] == ROWID_COLUMN) {
                blocks[fieldId] = buildSequenceBlock(filePosition, batchSize, rowsToKeep);
            } else {
                blocks[fieldId] = new LazyBlock(batchSize, new OrcBlockLoader(columnIndexes[fieldId], rowsToKeep));
            }
        }
        return new Page(rowsToKeep.keepAll() ? batchSize : rowsToKeep.size(), blocks);
    } catch (IOException | RuntimeException e) {
        closeWithSuppression(e);
        throw new PrestoException(RAPTOR_ERROR, e);
    }
}