Examples of com.facebook.presto.operator.Page

com.facebook.presto.operator.Page

    {
        if (positions == 0) {
            assertAggregation(function, confidence, expectedValue);
        }
        else {
            assertAggregation(function, confidence, expectedValue, new Page(positions, blocks));
        }
    }

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    // Adds the mask as the last channel
    private static Page[] maskPages(boolean maskValue, Page... pages)
    {
        Page[] maskedPages = new Page[pages.length];
        for (int i = 0; i < pages.length; i++) {
            Page page = pages[i];
            int positionCount = page.getPositionCount();
            int blockSize = SINGLE_BOOLEAN.getFixedSize() * positionCount;
            BlockBuilder blockBuilder = new BlockBuilder(SINGLE_BOOLEAN, blockSize, Slices.allocate(blockSize).getOutput());
            for (int j = 0; j < page.getPositionCount(); j++) {
                blockBuilder.append(maskValue);
            }
            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] = blockBuilder.build();


            maskedPages[i] = new Page(outputBlocks);
        }


        return maskedPages;
    }

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    private static Page[] reverseColumns(Page[] pages)
    {
        Page[] newPages = new Page[pages.length];
        for (int i = 0; i < pages.length; i++) {
            Page page = pages[i];
            if (page.getPositionCount() == 0) {
                newPages[i] = page;
            }
            else {
                Block[] newBlocks = Arrays.copyOf(page.getBlocks(), page.getChannelCount());
                Collections.reverse(Arrays.asList(newBlocks));
                newPages[i] = new Page(page.getPositionCount(), newBlocks);
            }
        }
        return newPages;
    }

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    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];
            if (page.getPositionCount() == 0) {
                newPages[i] = page;
            }
            else {
                Block[] newBlocks = new Block[page.getChannelCount() + offset];
                for (int channel = 0; channel < offset; channel++) {
                    newBlocks[channel] = new RunLengthEncodedBlock(NULL_BOOLEAN_TUPLE, 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;
    }

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        return selectSingleValue(operator);
    }


    public Object selectSingleValue(Operator operator)
    {
        Page output = getAtMostOnePage(operator, SOURCE_PAGE);


        assertNotNull(output);
        assertEquals(output.getPositionCount(), 1);
        assertEquals(output.getChannelCount(), 1);


        Block block = output.getBlock(0);
        assertEquals(block.getPositionCount(), 1);


        BlockCursor cursor = block.cursor();
        assertTrue(cursor.advanceNextPosition());
        if (cursor.isNull()) {

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        return executeFilter(operator);
    }


    private static boolean executeFilter(Operator operator)
    {
        Page page = getAtMostOnePage(operator, SOURCE_PAGE);


        boolean value;
        if (page != null) {
            assertEquals(page.getPositionCount(), 1);
            assertEquals(page.getChannelCount(), 1);


            BlockCursor cursor = page.getBlock(0).cursor();
            assertTrue(cursor.advanceNextPosition());
            assertTrue(cursor.getBoolean());
            value = true;
        }
        else {

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        return value;
    }


    private static boolean executeFilterWithNoInputColumns(Operator operator)
    {
        Page page = getAtMostOnePage(operator, ZERO_CHANNEL_PAGE);


        boolean value;
        if (page != null) {
            assertEquals(page.getPositionCount(), 1);
            assertEquals(page.getChannelCount(), 0);
            value = true;
        }
        else {
            value = false;
        }

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        if (operator.needsInput()) {
            operator.addInput(sourcePage);
        }


        // try to get the output page
        Page result = operator.getOutput();


        // tell operator to finish
        operator.finish();


        // try to get output until the operator is finished
        while (!operator.isFinished()) {
            // operator should never block
            assertTrue(operator.isBlocked().isDone());


            Page output = operator.getOutput();
            if (output != null) {
                assertNull(result);
                result = output;
            }
        }

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    }


    private static void importData(AlignmentOperator source, ColumnFileHandle fileHandle)
    {
        while (!source.isFinished()) {
            Page page = source.getOutput();
            if (page != null) {
                fileHandle.append(page);
            }
            checkState(source.isBlocked().isDone(), "Alignment operator is blocked");
        }

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                .toString();
    }


    private static List<TupleInfo> getTupleInfos(List<Page> pages)
    {
        Page firstPage = pages.get(0);
        List<TupleInfo> tupleInfos = new ArrayList<>();
        for (Block block : firstPage.getBlocks()) {
            tupleInfos.add(block.getTupleInfo());
        }
        return tupleInfos;
    }

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