Beispiel #1
0
 private static byte[] nextKey(byte[] key, RowKeySchema schema, ImmutableBytesWritable ptr) {
   int pos = 0;
   int maxOffset = schema.iterator(key, ptr);
   while (schema.next(ptr, pos, maxOffset) != null) {
     pos++;
   }
   Field field = schema.getField(pos - 1);
   if (!field.getDataType().isFixedWidth()) {
     byte[] newLowerRange = new byte[key.length + 1];
     System.arraycopy(key, 0, newLowerRange, 0, key.length);
     newLowerRange[key.length] =
         SchemaUtil.getSeparatorByte(schema.rowKeyOrderOptimizable(), key.length == 0, field);
     key = newLowerRange;
   } else {
     key = Arrays.copyOf(key, key.length);
   }
   ByteUtil.nextKey(key, key.length);
   return key;
 }
Beispiel #2
0
  public static int setKey(
      RowKeySchema schema,
      List<List<KeyRange>> slots,
      int[] slotSpan,
      int[] position,
      Bound bound,
      byte[] key,
      int byteOffset,
      int slotStartIndex,
      int slotEndIndex,
      int schemaStartIndex) {
    int offset = byteOffset;
    boolean lastInclusiveUpperSingleKey = false;
    boolean anyInclusiveUpperRangeKey = false;
    // The index used for slots should be incremented by 1,
    // but the index for the field it represents in the schema
    // should be incremented by 1 + value in the current slotSpan index
    // slotSpan stores the number of columns beyond one that the range spans
    Field field = null;
    int i = slotStartIndex, fieldIndex = ScanUtil.getRowKeyPosition(slotSpan, slotStartIndex);
    for (i = slotStartIndex; i < slotEndIndex; i++) {
      // Build up the key by appending the bound of each key range
      // from the current position of each slot.
      KeyRange range = slots.get(i).get(position[i]);
      // Use last slot in a multi-span column to determine if fixed width
      field = schema.getField(fieldIndex + slotSpan[i]);
      boolean isFixedWidth = field.getDataType().isFixedWidth();
      fieldIndex += slotSpan[i] + 1;
      /*
       * If the current slot is unbound then stop if:
       * 1) setting the upper bound. There's no value in
       *    continuing because nothing will be filtered.
       * 2) setting the lower bound when the type is fixed length
       *    for the same reason. However, if the type is variable width
       *    continue building the key because null values will be filtered
       *    since our separator byte will be appended and incremented.
       */
      if (range.isUnbound(bound) && (bound == Bound.UPPER || isFixedWidth)) {
        break;
      }
      byte[] bytes = range.getRange(bound);
      System.arraycopy(bytes, 0, key, offset, bytes.length);
      offset += bytes.length;
      /*
       * We must add a terminator to a variable length key even for the last PK column if
       * the lower key is non inclusive or the upper key is inclusive. Otherwise, we'd be
       * incrementing the key value itself, and thus bumping it up too much.
       */
      boolean inclusiveUpper = range.isInclusive(bound) && bound == Bound.UPPER;
      boolean exclusiveLower = !range.isInclusive(bound) && bound == Bound.LOWER;
      // If we are setting the upper bound of using inclusive single key, we remember
      // to increment the key if we exit the loop after this iteration.
      //
      // We remember to increment the last slot if we are setting the upper bound with an
      // inclusive range key.
      //
      // We cannot combine the two flags together in case for single-inclusive key followed
      // by the range-exclusive key. In that case, we do not need to increment the end at the
      // end. But if we combine the two flag, the single inclusive key in the middle of the
      // key slots would cause the flag to become true.
      lastInclusiveUpperSingleKey = range.isSingleKey() && inclusiveUpper;
      anyInclusiveUpperRangeKey |= !range.isSingleKey() && inclusiveUpper;
      // A null or empty byte array is always represented as a zero byte
      byte sepByte =
          SchemaUtil.getSeparatorByte(schema.rowKeyOrderOptimizable(), bytes.length == 0, field);

      if (!isFixedWidth
          && (fieldIndex < schema.getMaxFields()
              || inclusiveUpper
              || exclusiveLower
              || sepByte == QueryConstants.DESC_SEPARATOR_BYTE)) {
        key[offset++] = sepByte;
        // Set lastInclusiveUpperSingleKey back to false if this is the last pk column
        // as we don't want to increment the null byte in this case
        lastInclusiveUpperSingleKey &= i < schema.getMaxFields() - 1;
      }
      // If we are setting the lower bound with an exclusive range key, we need to bump the
      // slot up for each key part. For an upper bound, we bump up an inclusive key, but
      // only after the last key part.
      if (exclusiveLower) {
        if (!ByteUtil.nextKey(key, offset)) {
          // Special case for not being able to increment.
          // In this case we return a negative byteOffset to
          // remove this part from the key being formed. Since the
          // key has overflowed, this means that we should not
          // have an end key specified.
          return -byteOffset;
        }
        // We're filtering on values being non null here, but we still need the 0xFF
        // terminator, since DESC keys ignore the last byte as it's expected to be
        // the terminator. Without this, we'd ignore the separator byte that was
        // just added and incremented.
        if (!isFixedWidth
            && bytes.length == 0
            && SchemaUtil.getSeparatorByte(schema.rowKeyOrderOptimizable(), false, field)
                == QueryConstants.DESC_SEPARATOR_BYTE) {
          key[offset++] = QueryConstants.DESC_SEPARATOR_BYTE;
        }
      }
    }
    if (lastInclusiveUpperSingleKey || anyInclusiveUpperRangeKey) {
      if (!ByteUtil.nextKey(key, offset)) {
        // Special case for not being able to increment.
        // In this case we return a negative byteOffset to
        // remove this part from the key being formed. Since the
        // key has overflowed, this means that we should not
        // have an end key specified.
        return -byteOffset;
      }
    }
    // Remove trailing separator bytes, since the columns may have been added
    // after the table has data, in which case there won't be a separator
    // byte.
    if (bound == Bound.LOWER) {
      while (--i >= schemaStartIndex
          && offset > byteOffset
          && !(field = schema.getField(--fieldIndex)).getDataType().isFixedWidth()
          && field.getSortOrder() == SortOrder.ASC
          && key[offset - 1] == QueryConstants.SEPARATOR_BYTE) {
        offset--;
        fieldIndex -= slotSpan[i];
      }
    }
    return offset - byteOffset;
  }
Beispiel #3
0
  public static ScanRanges create(
      RowKeySchema schema,
      List<List<KeyRange>> ranges,
      int[] slotSpan,
      KeyRange minMaxRange,
      Integer nBuckets,
      boolean useSkipScan,
      int rowTimestampColIndex) {
    int offset = nBuckets == null ? 0 : SaltingUtil.NUM_SALTING_BYTES;
    int nSlots = ranges.size();
    if (nSlots == offset && minMaxRange == KeyRange.EVERYTHING_RANGE) {
      return EVERYTHING;
    } else if (minMaxRange == KeyRange.EMPTY_RANGE
        || (nSlots == 1 + offset
            && ranges.get(offset).size() == 1
            && ranges.get(offset).get(0) == KeyRange.EMPTY_RANGE)) {
      return NOTHING;
    }
    TimeRange rowTimestampRange = getRowTimestampColumnRange(ranges, schema, rowTimestampColIndex);
    boolean isPointLookup = isPointLookup(schema, ranges, slotSpan, useSkipScan);
    if (isPointLookup) {
      // TODO: consider keeping original to use for serialization as it would be smaller?
      List<byte[]> keys = ScanRanges.getPointKeys(ranges, slotSpan, schema, nBuckets);
      List<KeyRange> keyRanges = Lists.newArrayListWithExpectedSize(keys.size());
      KeyRange unsaltedMinMaxRange = minMaxRange;
      if (nBuckets != null && minMaxRange != KeyRange.EVERYTHING_RANGE) {
        unsaltedMinMaxRange =
            KeyRange.getKeyRange(
                stripPrefix(minMaxRange.getLowerRange(), offset),
                minMaxRange.lowerUnbound(),
                stripPrefix(minMaxRange.getUpperRange(), offset),
                minMaxRange.upperUnbound());
      }
      // We have full keys here, so use field from our varbinary schema
      BytesComparator comparator = ScanUtil.getComparator(SchemaUtil.VAR_BINARY_SCHEMA.getField(0));
      for (byte[] key : keys) {
        // Filter now based on unsalted minMaxRange and ignore the point key salt byte
        if (unsaltedMinMaxRange.compareLowerToUpperBound(
                    key, offset, key.length - offset, true, comparator)
                <= 0
            && unsaltedMinMaxRange.compareUpperToLowerBound(
                    key, offset, key.length - offset, true, comparator)
                >= 0) {
          keyRanges.add(KeyRange.getKeyRange(key));
        }
      }
      ranges = Collections.singletonList(keyRanges);
      useSkipScan = keyRanges.size() > 1;
      // Treat as binary if descending because we've got a separator byte at the end
      // which is not part of the value.
      if (keys.size() > 1
          || SchemaUtil.getSeparatorByte(schema.rowKeyOrderOptimizable(), false, schema.getField(0))
              == QueryConstants.DESC_SEPARATOR_BYTE) {
        schema = SchemaUtil.VAR_BINARY_SCHEMA;
        slotSpan = ScanUtil.SINGLE_COLUMN_SLOT_SPAN;
      } else {
        // Keep original schema and don't use skip scan as it's not necessary
        // when there's a single key.
        slotSpan = new int[] {schema.getMaxFields() - 1};
      }
    }
    List<List<KeyRange>> sortedRanges = Lists.newArrayListWithExpectedSize(ranges.size());
    for (int i = 0; i < ranges.size(); i++) {
      List<KeyRange> sorted = Lists.newArrayList(ranges.get(i));
      Collections.sort(sorted, KeyRange.COMPARATOR);
      sortedRanges.add(ImmutableList.copyOf(sorted));
    }

    // Don't set minMaxRange for point lookup because it causes issues during intersect
    // by going across region boundaries
    KeyRange scanRange = KeyRange.EVERYTHING_RANGE;
    // if (!isPointLookup && (nBuckets == null || !useSkipScanFilter)) {
    // if (! ( isPointLookup || (nBuckets != null && useSkipScanFilter) ) ) {
    // if (nBuckets == null || (nBuckets != null && (!isPointLookup || !useSkipScanFilter))) {
    if (nBuckets == null || !isPointLookup || !useSkipScan) {
      byte[] minKey = ScanUtil.getMinKey(schema, sortedRanges, slotSpan);
      byte[] maxKey = ScanUtil.getMaxKey(schema, sortedRanges, slotSpan);
      // If the maxKey has crossed the salt byte boundary, then we do not
      // have anything to filter at the upper end of the range
      if (ScanUtil.crossesPrefixBoundary(maxKey, ScanUtil.getPrefix(minKey, offset), offset)) {
        maxKey = KeyRange.UNBOUND;
      }
      // We won't filter anything at the low end of the range if we just have the salt byte
      if (minKey.length <= offset) {
        minKey = KeyRange.UNBOUND;
      }
      scanRange = KeyRange.getKeyRange(minKey, maxKey);
    }
    if (minMaxRange != KeyRange.EVERYTHING_RANGE) {
      minMaxRange =
          ScanUtil.convertToInclusiveExclusiveRange(
              minMaxRange, schema, new ImmutableBytesWritable());
      scanRange = scanRange.intersect(minMaxRange);
    }

    if (scanRange == KeyRange.EMPTY_RANGE) {
      return NOTHING;
    }
    return new ScanRanges(
        schema,
        slotSpan,
        sortedRanges,
        scanRange,
        minMaxRange,
        useSkipScan,
        isPointLookup,
        nBuckets,
        rowTimestampRange);
  }