Java Block类代码示例

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@ScalarFunction("parse_agent")
@Description("Returns Map, which has keys such as 'category', 'name', 'os', 'version', 'vendor' and 'os_version'")
@SqlType("map<varchar,varchar>")
public Block parseAgent(@TypeParameter("map<varchar,varchar>") Type mapType, @SqlType(StandardTypes.VARCHAR) Slice slice) {
    String argument = slice.toStringUtf8();
    Map<String, String> stringMap = Classifier.parse(argument);

    if (pageBuilder.isFull()) {
        pageBuilder.reset();
    }

    BlockBuilder blockBuilder = pageBuilder.getBlockBuilder(0);
    BlockBuilder singleMapBlockBuilder = blockBuilder.beginBlockEntry();
    for (Map.Entry<String, String> entry : stringMap.entrySet()) {
        VARCHAR.writeSlice(singleMapBlockBuilder, Slices.utf8Slice(entry.getKey()));
        VARCHAR.writeSlice(singleMapBlockBuilder, Slices.utf8Slice(entry.getValue()));
    }
    blockBuilder.closeEntry();
    pageBuilder.declarePosition();

    return (Block) mapType.getObject(blockBuilder, blockBuilder.getPositionCount() - 1);
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@Override
public final void load(LazyBlock lazyBlock)
{
    if (loaded) {
        return;
    }

    checkState(batchId == expectedBatchId);

    try {
        Block block = parquetReader.readPrimitive(columnDescriptor, type);
        lazyBlock.setBlock(block);
    }
    catch (IOException e) {
        throw new HdfsCursorException();
    }
    loaded = true;
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@Test
public void testPoly_contains() throws Exception {


    double[] poly = new double[]{
            45, 9.5,
            45.5, 9.5,
            45.5, 9,
            46, 9,
            46, 10,
            45, 10
    };

    Block blockPoly = toBlock(poly);
    assertFalse(PolyContains.contains(DoubleType.DOUBLE, blockPoly, 6, 3));
    assertFalse(PolyContains.contains(DoubleType.DOUBLE, blockPoly, 45, 9));
    assertTrue(PolyContains.contains(DoubleType.DOUBLE, blockPoly, 45.7, 9.7));

}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@Override
public void addInput(Page page)
{
    requireNonNull(page, "page is null");
    checkState(state == State.RUNNING, "Operator is %s", state);

    Block[] blocks = new Block[inputChannels.size()];
    for (int outputChannel = 0; outputChannel < inputChannels.size(); outputChannel++) {
        blocks[outputChannel] = page.getBlock(inputChannels.get(outputChannel));
    }
    Block sampleWeightBlock = null;
    if (sampleWeightChannel.isPresent()) {
        sampleWeightBlock = page.getBlock(sampleWeightChannel.get());
    }
    pageSink.appendPage(new Page(blocks), sampleWeightBlock);
    rowCount += page.getPositionCount();
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@Test
public void testRoundTrip()
{
    BlockBuilder expectedBlockBuilder = VARCHAR.createBlockBuilder(new BlockBuilderStatus(), 5);
    VARCHAR.writeString(expectedBlockBuilder, "alice");
    VARCHAR.writeString(expectedBlockBuilder, "bob");
    VARCHAR.writeString(expectedBlockBuilder, "charlie");
    VARCHAR.writeString(expectedBlockBuilder, "dave");
    Block expectedBlock = expectedBlockBuilder.build();

    Page expectedPage = new Page(expectedBlock, expectedBlock, expectedBlock);

    DynamicSliceOutput sliceOutput = new DynamicSliceOutput(1024);
    writePages(blockEncodingManager, sliceOutput, expectedPage, expectedPage, expectedPage);

    List<Type> types = ImmutableList.<Type>of(VARCHAR, VARCHAR, VARCHAR);
    Iterator<Page> pageIterator = readPages(blockEncodingManager, sliceOutput.slice().getInput());
    assertPageEquals(types, pageIterator.next(), expectedPage);
    assertPageEquals(types, pageIterator.next(), expectedPage);
    assertPageEquals(types, pageIterator.next(), expectedPage);
    assertFalse(pageIterator.hasNext());
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
public static Block toArray(Type arrayType, ConnectorSession connectorSession, Slice json)
{
    try {
        List<?> array = (List<?>) stackRepresentationToObject(connectorSession, json, arrayType);
        if (array == null) {
            return null;
        }
        Type elementType = ((ArrayType) arrayType).getElementType();
        BlockBuilder blockBuilder = elementType.createBlockBuilder(new BlockBuilderStatus(), array.size());
        for (Object element : array) {
            appendToBlockBuilder(elementType, element, blockBuilder);
        }
        return blockBuilder.build();
    }
    catch (RuntimeException e) {
        throw new PrestoException(INVALID_CAST_ARGUMENT, "Value cannot be cast to " + arrayType, e);
    }
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
private static IntComparator IntBlockCompare(Type type, Block block)
{
    return new AbstractIntComparator()
    {
        @Override
        public int compare(int left, int right)
        {
            if (block.isNull(left) && block.isNull(right)) {
                return 0;
            }
            if (block.isNull(left)) {
                return -1;
            }
            if (block.isNull(right)) {
                return 1;
            }
            return type.compareTo(block, left, block, right);
        }
    };
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
private static Page[] offsetColumns(Page[] pages, int offset)
{
    Page[] newPages = new Page[pages.length];
    for (int i = 0; i < pages.length; i++) {
        Page page = pages[i];
        Block[] newBlocks = new Block[page.getChannelCount() + offset];
        for (int channel = 0; channel < offset; channel++) {
            newBlocks[channel] = createNullRLEBlock(page.getPositionCount());
        }
        for (int channel = 0; channel < page.getBlocks().length; channel++) {
            newBlocks[channel + offset] = page.getBlocks()[channel];
        }
        newPages[i] = new Page(page.getPositionCount(), newBlocks);
    }
    return newPages;
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
public static Block createTestBlock()
{
    BlockBuilder blockBuilder = TIMESTAMP.createBlockBuilder(new BlockBuilderStatus(), 15);
    TIMESTAMP.writeLong(blockBuilder, 1111);
    TIMESTAMP.writeLong(blockBuilder, 1111);
    TIMESTAMP.writeLong(blockBuilder, 1111);
    TIMESTAMP.writeLong(blockBuilder, 2222);
    TIMESTAMP.writeLong(blockBuilder, 2222);
    TIMESTAMP.writeLong(blockBuilder, 2222);
    TIMESTAMP.writeLong(blockBuilder, 2222);
    TIMESTAMP.writeLong(blockBuilder, 2222);
    TIMESTAMP.writeLong(blockBuilder, 3333);
    TIMESTAMP.writeLong(blockBuilder, 3333);
    TIMESTAMP.writeLong(blockBuilder, 4444);
    return blockBuilder.build();
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@UsedByGeneratedCode
public static long arrayPosition(Type type, MethodHandle equalMethodHandle, Block array, boolean element)
{
    int size = array.getPositionCount();
    for (int i = 0; i < size; i++) {
        if (!array.isNull(i)) {
            boolean arrayValue = type.getBoolean(array, i);
            try {
                if ((boolean) equalMethodHandle.invokeExact(arrayValue, element)) {
                    return i + 1; // result is 1-based (instead of 0)
                }
            }
            catch (Throwable t) {
                Throwables.propagateIfInstanceOf(t, Error.class);
                Throwables.propagateIfInstanceOf(t, PrestoException.class);
                throw new PrestoException(INTERNAL_ERROR, t);
            }
        }
    }
    return 0;
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@Override
public final void load(LazyBlock lazyBlock)
{
    if (loaded) {
        return;
    }

    checkState(batchId == expectedBatchId);

    try {
        Block block = parquetReader.readBlock(columnDescriptor, batchSize, type);
        lazyBlock.setBlock(block);
    }
    catch (IOException e) {
        throw new PrestoException(HIVE_CURSOR_ERROR, e);
    }
    loaded = true;
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@UsedByGeneratedCode
public static Object subscript(MethodHandle keyEqualsMethod, Type keyType, Type valueType, Block map, double key)
{
    for (int position = 0; position < map.getPositionCount(); position += 2) {
        try {
            if ((boolean) keyEqualsMethod.invokeExact(keyType.getDouble(map, position), key)) {
                return readNativeValue(valueType, map, position + 1); // position + 1: value position
            }
        }
        catch (Throwable t) {
            Throwables.propagateIfInstanceOf(t, Error.class);
            Throwables.propagateIfInstanceOf(t, PrestoException.class);
            throw new PrestoException(INTERNAL_ERROR, t);
        }
    }
    return null;
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
public static void combine(KeyValuePairsState state, KeyValuePairsState otherState)
{
    if (state.get() != null && otherState.get() != null) {
        Block keys = otherState.get().getKeys();
        Block values = otherState.get().getValues();
        KeyValuePairs pairs = state.get();
        long startSize = pairs.estimatedInMemorySize();
        for (int i = 0; i < keys.getPositionCount(); i++) {
            try {
                pairs.add(keys, values, i, i);
            }
            catch (ExceededMemoryLimitException e) {
                throw new PrestoException(INVALID_FUNCTION_ARGUMENT, format("The result of map_agg may not exceed %s", e.getMaxMemory()));
            }
        }
        state.addMemoryUsage(pairs.estimatedInMemorySize() - startSize);
    }
    else if (state.get() == null) {
        state.set(otherState.get());
    }
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
@Override
public void addInput(Page page)
{
    requireNonNull(page, "page is null");
    checkState(!finishing, "Operator is finishing");
    checkState(outputPage == null, "Operator still has pending output");
    operatorContext.setMemoryReservation(markDistinctHash.getEstimatedSize());

    Block markerBlock = markDistinctHash.markDistinctRows(page);

    // add the new boolean column to the page
    Block[] sourceBlocks = page.getBlocks();
    Block[] outputBlocks = new Block[sourceBlocks.length + 1]; // +1 for the single boolean output channel

    System.arraycopy(sourceBlocks, 0, outputBlocks, 0, sourceBlocks.length);
    outputBlocks[sourceBlocks.length] = markerBlock;

    outputPage = new Page(outputBlocks);
}
 

import com.facebook.presto.spi.block.Block; //导入依赖的package包/类
public static void input(BlockComparator comparator, Type valueType, Type keyType, MinMaxByNState state, Block value, Block key, int blockIndex, long n)
{
    TypedKeyValueHeap heap = state.getTypedKeyValueHeap();
    if (heap == null) {
        if (n <= 0) {
            throw new PrestoException(INVALID_FUNCTION_ARGUMENT, "third argument of max_by/min_by must be a positive integer");
        }
        heap = new TypedKeyValueHeap(comparator, keyType, valueType, Ints.checkedCast(n));
        state.setTypedKeyValueHeap(heap);
    }

    long startSize = heap.getEstimatedSize();
    if (!key.isNull(blockIndex)) {
        heap.add(key, value, blockIndex);
    }
    state.addMemoryUsage(heap.getEstimatedSize() - startSize);
}