Examples of com.facebook.presto.operator.Page

com.facebook.presto.operator.Page

        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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        checkType(split, TestingSplit.class, "split");


        // TODO: check for !columns.isEmpty() -- currently, it breaks TestSqlTaskManager
        // and fixing it requires allowing TableScan nodes with no assignments


        return new ValuesOperator(operatorContext, ImmutableList.of(new Page(1)));
    }

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                .appendSlice(Slices.utf8Slice("alice"))
                .appendSlice(Slices.utf8Slice("bob"))
                .appendSlice(Slices.utf8Slice("charlie"))
                .appendSlice(Slices.utf8Slice("dave"))
                .build();
        Page expectedPage = new Page(expectedBlock, expectedBlock, expectedBlock);


        DynamicSliceOutput sliceOutput = new DynamicSliceOutput(1024);
        writePages(createTestingBlockEncodingManager(), sliceOutput, expectedPage, expectedPage, expectedPage);
        Iterator<Page> pageIterator = readPages(createTestingBlockEncodingManager(), sliceOutput.slice().getInput());
        assertPageEquals(pageIterator.next(), expectedPage);

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    public void testBigintSerializedSize()
    {
        BlockBuilder builder = BIGINT.createBlockBuilder(new BlockBuilderStatus());


        // empty page
        Page page = new Page(builder.build());
        int pageSize = serializedSize(page);
        assertEquals(pageSize, 26); // page overhead


        // page with one value
        page = new Page(builder.appendLong(123).build());
        int firstValueSize = serializedSize(page) - pageSize;
        assertEquals(firstValueSize, 8 + 1); // value size + value overhead


        // page with two values
        page = new Page(builder.appendLong(456).build());
        int secondValueSize = serializedSize(page) - (pageSize + firstValueSize);
        assertEquals(secondValueSize, 8 + 1); // value size + value overhead
    }

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    public void testVarcharSerializedSize()
    {
        BlockBuilder builder = VARCHAR.createBlockBuilder(new BlockBuilderStatus());


        // empty page
        Page page = new Page(builder.build());
        int pageSize = serializedSize(page);
        assertEquals(pageSize, 27); // page overhead


        // page with one value
        page = new Page(builder.appendSlice(Slices.utf8Slice("alice")).build());
        int firstValueSize = serializedSize(page) - pageSize;
        assertEquals(firstValueSize, 4 + 5 + 5); // "alice" + value overhead


        // page with two values
        page = new Page(builder.appendSlice(Slices.utf8Slice("bob")).build());
        int secondValueSize = serializedSize(page) - (pageSize + firstValueSize);
        assertEquals(secondValueSize, 4 + 3 + 5); // "bob" + value overhead
    }

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            List<String> data = ImmutableList.of("apple", "banana", "cherry", "date");


            // load initial pages
            for (int i = 0; i < initialPages; i++) {
                checkState(sharedBuffer.enqueue(new Page(createStringsBlock(Iterables.concat(Collections.nCopies(i + 1, data))))).isDone(), "Unable to add page to buffer");
            }
            sharedBuffer.finish();
        }

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                .toString();
    }


    private static List<Type> getTypes(List<Page> pages)
    {
        Page firstPage = pages.get(0);
        List<Type> types = new ArrayList<>();
        for (Block block : firstPage.getBlocks()) {
            types.add(block.getType());
        }
        return types;
    }

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