Package com.facebook.presto.spi.block

Examples of com.facebook.presto.spi.block.BlockCursor

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    @Override
    public void appendTo(PageBuilder pageBuilder)
    {
        for (int outputIndex = 0; outputIndex < cursors.length; outputIndex++) {
            BlockCursor cursor = cursors[outputIndex];
            cursor.appendTo(pageBuilder.getBlockBuilder(outputIndex));
        }
    }
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        }

        @Override
        protected void processInput(Block block, Optional<Block> maskBlock, Optional<Block> sampleWeightBlock)
        {
            BlockCursor values = block.cursor();
            BlockCursor sampleWeights = sampleWeightBlock.get().cursor();
            BlockCursor masks = null;
            if (maskBlock.isPresent()) {
                masks = maskBlock.get().cursor();
            }

            for (int i = 0; i < block.getPositionCount(); i++) {
                checkState(masks == null || masks.advanceNextPosition(), "failed to advance mask cursor");
                checkState(sampleWeights.advanceNextPosition(), "failed to advance weight cursor");
                checkState(values.advanceNextPosition(), "failed to advance values cursor");
                long weight = values.isNull() ? 0 : SimpleAggregationFunction.computeSampleWeight(masks, sampleWeights);
                if (!values.isNull() && weight > 0) {
                    double value = values.getDouble();
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        }

        @Override
        public void processIntermediate(Block block)
        {
            BlockCursor intermediates = block.cursor();

            OnlineVarianceCalculator calculator = new OnlineVarianceCalculator();
            for (int position = 0; position < block.getPositionCount(); position++) {
                checkState(intermediates.advanceNextPosition(), "failed to advance intermediates cursor");
                Slice slice = intermediates.getSlice();
                sum += slice.getDouble(SUM_OFFSET);
                count += slice.getLong(COUNT_OFFSET);
                calculator.deserializeFrom(slice, VARIANCE_OFFSET);
                this.calculator.merge(calculator);
            }
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        @Override
        protected void processInput(GroupByIdBlock groupIdsBlock, Block valuesBlock, Optional<Block> maskBlock, Optional<Block> sampleWeightBlock)
        {
            ensureCapacity(groupIdsBlock.getGroupCount());

            BlockCursor values = valuesBlock.cursor();
            BlockCursor masks = null;
            if (maskBlock.isPresent()) {
                masks = maskBlock.get().cursor();
            }

            for (int position = 0; position < groupIdsBlock.getPositionCount(); position++) {
                checkState(values.advanceNextPosition());
                checkState(masks == null || masks.advanceNextPosition());

                // skip null values
                if (!values.isNull() && (masks == null || masks.getBoolean())) {
                    long groupId = groupIdsBlock.getGroupId(position);

                    // todo do all of this with shifts and masks
                    long globalOffset = groupId * ENTRY_SIZE;
                    int sliceIndex = Ints.checkedCast(globalOffset / SLICE_SIZE);
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        @Override
        protected void processIntermediate(GroupByIdBlock groupIdsBlock, Block valuesBlock)
        {
            ensureCapacity(groupIdsBlock.getGroupCount());

            BlockCursor intermediates = valuesBlock.cursor();

            for (int position = 0; position < groupIdsBlock.getPositionCount(); position++) {
                checkState(intermediates.advanceNextPosition());

                // skip null values
                if (!intermediates.isNull()) {
                    long groupId = groupIdsBlock.getGroupId(position);

                    // todo do all of this with shifts and masks
                    long globalOffset = groupId * ENTRY_SIZE;
                    int sliceIndex = Ints.checkedCast(globalOffset / SLICE_SIZE);
                    Slice slice = slices.get(sliceIndex);
                    int sliceOffset = Ints.checkedCast(globalOffset - (sliceIndex * SLICE_SIZE));

                    Slice input = intermediates.getSlice();

                    ESTIMATOR.mergeInto(slice, sliceOffset + 1, input, 0);
                    setNotNull(slice, sliceOffset);
                }
            }
            checkState(!intermediates.advanceNextPosition());
        }
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        }

        @Override
        protected void processInput(Block block, Optional<Block> maskBlock, Optional<Block> sampleWeightBlock)
        {
            BlockCursor values = block.cursor();
            BlockCursor masks = null;
            if (maskBlock.isPresent()) {
                masks = maskBlock.get().cursor();
            }

            for (int position = 0; position < block.getPositionCount(); position++) {
                checkState(values.advanceNextPosition());
                checkState(masks == null || masks.advanceNextPosition());
                if (!values.isNull() && (masks == null || masks.getBoolean())) {
                    notNull = true;

                    long hash = hash(values, parameterType);
                    ESTIMATOR.update(hash, slice, 0);
                }
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        }

        @Override
        protected void processIntermediate(Block block)
        {
            BlockCursor intermediates = block.cursor();

            for (int position = 0; position < block.getPositionCount(); position++) {
                checkState(intermediates.advanceNextPosition());
                if (!intermediates.isNull()) {
                    notNull = true;

                    Slice input = intermediates.getSlice();
                    ESTIMATOR.mergeInto(slice, 0, input, 0);
                }
            }
        }
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        }

        @Override
        protected void processInput(Block block, Optional<Block> maskBlock, Optional<Block> sampleWeightBlock)
        {
            BlockCursor values = block.cursor();
            BlockCursor masks = null;
            if (maskBlock.isPresent()) {
                masks = maskBlock.get().cursor();
            }

            for (int position = 0; position < block.getPositionCount(); position++) {
                checkState(values.advanceNextPosition());
                checkState(masks == null || masks.advanceNextPosition());
                if (!values.isNull() && (masks == null || masks.getBoolean())) {
                    if (estimator == null) {
                        estimator = HyperLogLog.newInstance(NUMBER_OF_BUCKETS);
                    }

                    add(values, parameterType, estimator);
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        }

        @Override
        protected void processIntermediate(Block block)
        {
            BlockCursor intermediates = block.cursor();

            for (int position = 0; position < block.getPositionCount(); position++) {
                checkState(intermediates.advanceNextPosition());
                if (!intermediates.isNull()) {
                    HyperLogLog instance = HyperLogLog.newInstance(intermediates.getSlice());

                    if (estimator == null) {
                        estimator = instance;
                    }
                    else {
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        if (encoding == null) {
            encoding = new RunLengthBlockEncoding(block.getEncoding());
        }

        BlockCursor cursor = block.cursor();
        while (cursor.advanceNextPosition()) {
            if (lastValue == null) {
                lastValue = cursor.getSingleValueBlock();
            }
            else if (!lastValue.equalTo(0, cursor)) {
                writeBlock();
                lastValue = cursor.getSingleValueBlock();
            }
            positionCount++;
        }

        return this;
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