presto-spi/src/main/java/io/prestosql/spi/connector/classloader/ClassLoaderSafeConnectorMetadata.java/ClassLoaderSafeConnectorMetadata/listTableColumns
class ClassLoaderSafeConnectorMetadata:    @Override
    public Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix)
    {
        try (ThreadContextClassLoader ignored = new ThreadContextClassLoader(classLoader)) {
            return delegate.listTableColumns(session, prefix);
        }
    }