Package com.facebook.presto.block

Examples of com.facebook.presto.block.BlockCursor

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        @Override
        protected void processIntermediate(GroupByIdBlock groupIdsBlock, Block valuesBlock)
        {
            counts.ensureCapacity(groupIdsBlock.getGroupCount());

            BlockCursor values = valuesBlock.cursor();

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

                if (!values.isNull()) {
                    long groupId = groupIdsBlock.getGroupId(position);
                    counts.add(groupId, values.getLong());
                }
            }
            checkState(!values.advanceNextPosition());
        }
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        assertEquals(output.getChannelCount(), 1);

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

        BlockCursor cursor = block.cursor();
        assertTrue(cursor.advanceNextPosition());
        if (cursor.isNull()) {
            return null;
        }
        else {
            return cursor.getTuple().getObjectValue();
        }
    }
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        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 {
            value = false;
        }
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        assertEquals(output.getChannelCount(), 1);

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

        BlockCursor cursor = block.cursor();
        assertTrue(cursor.advanceNextPosition());
        if (cursor.isNull()) {
            return null;
        }
        else {
            return cursor.getTuple().getObjectValue();
        }
    }
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        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 {
            value = false;
        }
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        @Override
        public void addInput(Page page)
        {
            checkArgument(valueChannel != -1, "Raw input is not allowed for a final aggregation");

            BlockCursor values = page.getBlock(valueChannel).cursor();
            BlockCursor percentiles = page.getBlock(percentileChannel).cursor();
            BlockCursor masks = null;
            if (maskChannel.isPresent()) {
                masks = page.getBlock(maskChannel.get()).cursor();
            }

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

                if (!values.isNull() && (masks == null || masks.getBoolean())) {
                    addValue(digest, values, parameterType);

                    // use last non-null percentile
                    if (!percentiles.isNull()) {
                        percentile = percentiles.getDouble();
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        @Override
        public void addIntermediate(Block block)
        {
            checkArgument(valueChannel == -1, "Intermediate input is only allowed for a final aggregation");

            BlockCursor intermediates = block.cursor();

            for (int position = 0; position < block.getPositionCount(); position++) {
                checkState(intermediates.advanceNextPosition());
                if (!intermediates.isNull()) {
                    SliceInput input = intermediates.getSlice().getInput();
                    // read digest
                    digest.merge(QuantileDigest.deserialize(input));
                    // read percentile
                    percentile = input.readDouble();
                }
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        public void addBlock(Block sourceBlock)
        {
            operatorContext.setMemoryReservation(getEstimatedSize());

            BlockCursor sourceCursor = sourceBlock.cursor();
            Slice sourceSlice = ((UncompressedBlock) sourceBlock).getSlice();
            strategy.setLookupSlice(sourceSlice);

            for (int position = 0; position < sourceBlock.getPositionCount(); position++) {
                checkState(sourceCursor.advanceNextPosition());

                // Record whether we have seen a null
                containsNull |= sourceCursor.isNull();

                long sourceAddress = encodeSyntheticAddress(LOOKUP_SLICE_INDEX, sourceCursor.getRawOffset());

                if (!addressValueSet.contains(sourceAddress)) {
                    int length = tupleInfo.size(sourceSlice, sourceCursor.getRawOffset());
                    if (blockBuilder.writableBytes() < length) {
                        Slice slice = Slices.allocate(Math.max((int) BlockBuilder.DEFAULT_MAX_BLOCK_SIZE.toBytes(), length));
                        strategy.addSlice(slice);
                        blockBuilder = new BlockBuilder(tupleInfo, slice.length(), slice.getOutput());
                        currentBlockId++;
                    }
                    int blockRawOffset = blockBuilder.size();
                    blockBuilder.appendTuple(sourceSlice, sourceCursor.getRawOffset(), length);
                    addressValueSet.add(encodeSyntheticAddress(currentBlockId, blockRawOffset));
                }
            }
        }
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        {
            counts.ensureCapacity(groupIdsBlock.getGroupCount());
            means.ensureCapacity(groupIdsBlock.getGroupCount());
            m2s.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());

                if (!values.isNull() && (masks == null || masks.getBoolean())) {

                    long groupId = groupIdsBlock.getGroupId(position);
                    double inputValue;
                    if (inputIsLong) {
                        inputValue = values.getLong();
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        {
            counts.ensureCapacity(groupIdsBlock.getGroupCount());
            means.ensureCapacity(groupIdsBlock.getGroupCount());
            m2s.ensureCapacity(groupIdsBlock.getGroupCount());

            BlockCursor values = valuesBlock.cursor();

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

                if (!values.isNull()) {
                    long groupId = groupIdsBlock.getGroupId(position);

                    Slice slice = values.getSlice();
                    long inputCount = getCount(slice);
                    double inputMean = getMean(slice);
                    double inputM2 = getM2(slice);

                    long currentCount = counts.get(groupId);
                    double currentMean = means.get(groupId);
                    double currentM2 = m2s.get(groupId);

                    // Use numerically stable variant
                    long newCount = currentCount + inputCount;
                    double newMean = ((currentCount * currentMean) + (inputCount * inputMean)) / newCount;
                    double delta = inputMean - currentMean;
                    double newM2 = currentM2 + inputM2 + ((delta * delta) * (currentCount * inputCount)) / newCount;

                    counts.set(groupId, newCount);
                    means.set(groupId, newMean);
                    m2s.set(groupId, newM2);
                }
            }
            checkState(!values.advanceNextPosition());
        }
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Related Classes of com.facebook.presto.block.BlockCursor

  • com.facebook.presto.benchmark.HandTpchQuery1$TpchQuery1Operator
  • com.facebook.presto.benchmark.HandTpchQuery6$TpchQuery6Operator
  • com.facebook.presto.block.uncompressed.AbstractTestSingleColumnBlockCursorWithNulls
  • com.facebook.presto.block.uncompressed.UncompressedSliceBlock
  • com.facebook.presto.operator.aggregation.AbstractTestAggregationFunction
  • com.facebook.presto.operator.aggregation.AbstractTestApproximateCountDistinct
  • com.facebook.presto.operator.aggregation.ApproximateAverageAggregation$ApproximateAverageAccumulator
  • com.facebook.presto.operator.aggregation.ApproximateAverageAggregation$ApproximateAverageGroupedAccumulator
  • com.facebook.presto.operator.aggregation.ApproximateCountAggregation$ApproximateCountGroupedAccumulator
  • com.facebook.presto.operator.aggregation.ApproximateCountAggregation$CountAccumulator
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