presto-memory/src/main/java/io/prestosql/plugin/memory/MemoryMetadata.java/MemoryMetadata/getTableHandle
class MemoryMetadata:    @Override
    public synchronized ConnectorTableHandle getTableHandle(ConnectorSession session, SchemaTableName schemaTableName)
    {
        Long id = tableIds.get(schemaTableName);
        if (id == null) {
            return null;
        }

        return new MemoryTableHandle(id);
    }