presto-main/src/main/java/io/prestosql/metadata/MetadataManager.java/MetadataManager/addBlockEncoding
class MetadataManager:    public void addBlockEncoding(BlockEncoding blockEncoding)
    {
        requireNonNull(blockEncoding, "blockEncoding is null");
        BlockEncoding existingEntry = blockEncodings.putIfAbsent(blockEncoding.getName(), blockEncoding);
        checkArgument(existingEntry == null, "Encoding already registered: %s", blockEncoding.getName());
    }