cassandra-four-zero-types/src/main/java/org/apache/cassandra/utils/ColumnTypes.java [43:61]:
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    public static ByteBuffer buildPartitionKey(@NotNull CqlTable table, @NotNull List<String> keys)
    {
        List<AbstractType<?>> partitionKeyColumnTypes = partitionKeyColumnTypes(table);
        if (table.partitionKeys().size() == 1)
        {
            // Single partition key
            return partitionKeyColumnTypes.get(0).fromString(keys.get(0));
        }
        else
        {
            // Composite partition key
            ByteBuffer[] buffers = new ByteBuffer[keys.size()];
            for (int index = 0; index < buffers.length; index++)
            {
                buffers[index] = partitionKeyColumnTypes.get(index).fromString(keys.get(index));
            }
            return CompositeType.build(ByteBufferAccessor.instance, buffers);
        }
    }
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cassandra-four-zero-bridge/src/main/java/org/apache/cassandra/bridge/CassandraBridgeImplementation.java [160:178]:
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    public static ByteBuffer buildPartitionKey(@NotNull CqlTable table, @NotNull List<String> keys)
    {
        List<AbstractType<?>> partitionKeyColumnTypes = partitionKeyColumnTypes(table);
        if (table.partitionKeys().size() == 1)
        {
            // Single partition key
            return partitionKeyColumnTypes.get(0).fromString(keys.get(0));
        }
        else
        {
            // Composite partition key
            ByteBuffer[] buffers = new ByteBuffer[keys.size()];
            for (int index = 0; index < buffers.length; index++)
            {
                buffers[index] = partitionKeyColumnTypes.get(index).fromString(keys.get(index));
            }
            return CompositeType.build(ByteBufferAccessor.instance, buffers);
        }
    }
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