Examples of org.apache.cassandra.thrift.SlicePredicate$SlicePredicateTupleScheme

org.apache.cassandra.thrift.SlicePredicate
kipedia.org/wiki/Predicate_(mathematical_logic)), which is described as "a property that the elements of a set have in common." SlicePredicate's in Cassandra are described with either a list of column_names or a SliceRange. If column_names is specified, slice_range is ignored. @param column_name. A list of column names to retrieve. This can be used similar to Memcached's "multi-get" featureto fetch N known column names. For instance, if you know you wish to fetch columns 'Joe', 'Jack', and 'Jim' you can pass those column names as a list to fetch all three at once. @param slice_range. A SliceRange describing how to range, order, and/or limit the slice.

    private List<Row> multiRangeSlice(List<ByteBuffer> variables) throws InvalidRequestException, TimedOutException, UnavailableException
    {
        List<Row> rows;


        // XXX: Our use of Thrift structs internally makes me Sad. :(
        SlicePredicate thriftSlicePredicate = makeSlicePredicate(variables);
        QueryProcessor.validateSlicePredicate(cfDef.cfm, thriftSlicePredicate);


        List<IndexExpression> expressions = getIndexExpressions(variables);


        try

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    }


    private SlicePredicate makeSlicePredicate(List<ByteBuffer> variables)
    throws InvalidRequestException
    {
        SlicePredicate thriftSlicePredicate = new SlicePredicate();


        if (isColumnRange())
        {
            SliceRange sliceRange = new SliceRange();
            sliceRange.start = getRequestedBound(Bound.START, variables);

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            startKey = ((DecoratedKey)start).key;
        }


        IndexClause clause = new IndexClause(row_filter, startKey, maxResults);
        // IndexScanCommand is deprecated so don't bother
        SlicePredicate pred = RangeSliceCommandSerializer.asSlicePredicate(predicate);
        return new IndexScanCommand(keyspace, column_family, clause, pred, range);
    }

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class RangeSliceCommandSerializer implements IVersionedSerializer<RangeSliceCommand>
{
    // For compatibility with pre-1.2 sake. We should remove at some point.
    public static SlicePredicate asSlicePredicate(IDiskAtomFilter predicate)
    {
        SlicePredicate sp = new SlicePredicate();
        if (predicate instanceof NamesQueryFilter)
        {
            sp.setColumn_names(new ArrayList<ByteBuffer>(((NamesQueryFilter)predicate).columns));
        }
        else
        {
            SliceQueryFilter sqf = (SliceQueryFilter)predicate;
            sp.setSlice_range(new SliceRange(sqf.start(), sqf.finish(), sqf.reversed, sqf.count));
        }
        return sp;
    }

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        IDiskAtomFilter predicate;
        AbstractType<?> comparator = ColumnFamily.getComparatorFor(keyspace, columnFamily, superColumn);
        if (version < MessagingService.VERSION_12)
        {
            SlicePredicate pred = new SlicePredicate();
            FBUtilities.deserialize(new TDeserializer(new TBinaryProtocol.Factory()), pred, dis);
            predicate = ThriftValidation.asIFilter(pred, comparator);
        }
        else
        {

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                new BufferCell(cellname(4L), ByteBufferUtil.bytes("val4"), 1),
                new BufferCell(cellname(5L), ByteBufferUtil.bytes("val5"), 1),
                new BufferCell(cellname(6L), ByteBufferUtil.bytes("val6"), 1));


        // verify insert.
        final SlicePredicate sp = new SlicePredicate();
        sp.setSlice_range(new SliceRange());
        sp.getSlice_range().setCount(100);
        sp.getSlice_range().setStart(ArrayUtils.EMPTY_BYTE_ARRAY);
        sp.getSlice_range().setFinish(ArrayUtils.EMPTY_BYTE_ARRAY);


        assertRowAndColCount(1, 6, false, cfs.getRangeSlice(Util.range("f", "g"), null, ThriftValidation.asIFilter(sp, cfs.metadata, scfName), 100));


        // delete
        Mutation rm = new Mutation(keyspace.getName(), key.getKey());

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        String cfName = "Standard1";
        Keyspace keyspace = Keyspace.open(keyspaceName);
        ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(cfName);
        DecoratedKey key = Util.dk("f-flush-resurrection");


        SlicePredicate sp = new SlicePredicate();
        sp.setSlice_range(new SliceRange());
        sp.getSlice_range().setCount(100);
        sp.getSlice_range().setStart(ArrayUtils.EMPTY_BYTE_ARRAY);
        sp.getSlice_range().setFinish(ArrayUtils.EMPTY_BYTE_ARRAY);


        // insert
        putColsStandard(cfs, key, column("col1", "val1", 1), column("col2", "val2", 1));
        assertRowAndColCount(1, 2, false, cfs.getRangeSlice(Util.range("f", "g"), null, ThriftValidation.asIFilter(sp, cfs.metadata, null), 100));

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        putColsStandard(cfs, Util.dk("a"), cols[0], cols[1], cols[2], cols[3], cols[4]);
        putColsStandard(cfs, Util.dk("b"), cols[0], cols[1]);
        putColsStandard(cfs, Util.dk("c"), cols[0], cols[1], cols[2], cols[3]);
        cfs.forceBlockingFlush();


        SlicePredicate sp = new SlicePredicate();
        sp.setSlice_range(new SliceRange());
        sp.getSlice_range().setCount(1);
        sp.getSlice_range().setStart(ArrayUtils.EMPTY_BYTE_ARRAY);
        sp.getSlice_range().setFinish(ArrayUtils.EMPTY_BYTE_ARRAY);


        assertTotalColCount(cfs.getRangeSlice(Util.range("", ""),
                                              null,
                                              ThriftValidation.asIFilter(sp, cfs.metadata, null),
                                              3,
                                              System.currentTimeMillis(),
                                              true,
                                              false),
                            3);
        assertTotalColCount(cfs.getRangeSlice(Util.range("", ""),
                                              null,
                                              ThriftValidation.asIFilter(sp, cfs.metadata, null),
                                              5,
                                              System.currentTimeMillis(),
                                              true,
                                              false),
                            5);
        assertTotalColCount(cfs.getRangeSlice(Util.range("", ""),
                                              null,
                                              ThriftValidation.asIFilter(sp, cfs.metadata, null),
                                              8,
                                              System.currentTimeMillis(),
                                              true,
                                              false),
                            8);
        assertTotalColCount(cfs.getRangeSlice(Util.range("", ""),
                                              null,
                                              ThriftValidation.asIFilter(sp, cfs.metadata, null),
                                              10,
                                              System.currentTimeMillis(),
                                              true,
                                              false),
                            10);
        assertTotalColCount(cfs.getRangeSlice(Util.range("", ""),
                                              null,
                                              ThriftValidation.asIFilter(sp, cfs.metadata, null),
                                              100,
                                              System.currentTimeMillis(),
                                              true,
                                              false),
                            11);


        // Check that when querying by name, we always include all names for a
        // gien row even if it means returning more columns than requested (this is necesseray for CQL)
        sp = new SlicePredicate();
        sp.setColumn_names(Arrays.asList(
            ByteBufferUtil.bytes("c0"),
            ByteBufferUtil.bytes("c1"),
            ByteBufferUtil.bytes("c2")
        ));

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        putColsStandard(cfs, ka, cols[0], cols[1], cols[2], cols[3]);
        putColsStandard(cfs, kb, cols[0], cols[1], cols[2]);
        putColsStandard(cfs, kc, cols[0], cols[1], cols[2], cols[3]);
        cfs.forceBlockingFlush();


        SlicePredicate sp = new SlicePredicate();
        sp.setSlice_range(new SliceRange());
        sp.getSlice_range().setCount(1);
        sp.getSlice_range().setStart(ArrayUtils.EMPTY_BYTE_ARRAY);
        sp.getSlice_range().setFinish(ArrayUtils.EMPTY_BYTE_ARRAY);


        Collection<Row> rows;
        Row row, row1, row2;
        IDiskAtomFilter filter = ThriftValidation.asIFilter(sp, cfs.metadata, null);


        rows = cfs.getRangeSlice(cfs.makeExtendedFilter(Util.range("", ""), filter, null, 3, true, true, System.currentTimeMillis()));
        assert rows.size() == 1 : "Expected 1 row, got " + toString(rows);
        row = rows.iterator().next();
        assertColumnNames(row, "c0", "c1", "c2");


        sp.getSlice_range().setStart(ByteBufferUtil.getArray(ByteBufferUtil.bytes("c2")));
        filter = ThriftValidation.asIFilter(sp, cfs.metadata, null);
        rows = cfs.getRangeSlice(cfs.makeExtendedFilter(new Bounds<RowPosition>(ka, min), filter, null, 3, true, true, System.currentTimeMillis()));
        assert rows.size() == 2 : "Expected 2 rows, got " + toString(rows);
        Iterator<Row> iter = rows.iterator();
        row1 = iter.next();
        row2 = iter.next();
        assertColumnNames(row1, "c2", "c3");
        assertColumnNames(row2, "c0");


        sp.getSlice_range().setStart(ByteBufferUtil.getArray(ByteBufferUtil.bytes("c0")));
        filter = ThriftValidation.asIFilter(sp, cfs.metadata, null);
        rows = cfs.getRangeSlice(cfs.makeExtendedFilter(new Bounds<RowPosition>(row2.key, min), filter, null, 3, true, true, System.currentTimeMillis()));
        assert rows.size() == 1 : "Expected 1 row, got " + toString(rows);
        row = rows.iterator().next();
        assertColumnNames(row, "c0", "c1", "c2");


        sp.getSlice_range().setStart(ByteBufferUtil.getArray(ByteBufferUtil.bytes("c2")));
        filter = ThriftValidation.asIFilter(sp, cfs.metadata, null);
        rows = cfs.getRangeSlice(cfs.makeExtendedFilter(new Bounds<RowPosition>(row.key, min), filter, null, 3, true, true, System.currentTimeMillis()));
        assert rows.size() == 2 : "Expected 2 rows, got " + toString(rows);
        iter = rows.iterator();
        row1 = iter.next();

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        {
            putColsStandard(cfs, idk(i), column("name", "value", 1));
        }
        cfs.forceBlockingFlush();


        SlicePredicate sp = new SlicePredicate();
        sp.setSlice_range(new SliceRange());
        sp.getSlice_range().setCount(1);
        sp.getSlice_range().setStart(ArrayUtils.EMPTY_BYTE_ARRAY);
        sp.getSlice_range().setFinish(ArrayUtils.EMPTY_BYTE_ARRAY);
        IDiskAtomFilter qf = ThriftValidation.asIFilter(sp, cfs.metadata, null);


        List<Row> rows;


        // Start and end inclusive

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