presto-atop/src/main/java/io/prestosql/plugin/atop/AtopMetadata.java/AtopMetadata/getColumnHandles
class AtopMetadata:    @Override
    public Map<String, ColumnHandle> getColumnHandles(ConnectorSession session, ConnectorTableHandle tableHandle)
    {
        AtopTableHandle atopTableHandle = (AtopTableHandle) tableHandle;
        ImmutableMap.Builder<String, ColumnHandle> columnHandles = ImmutableMap.builder();
        for (AtopColumn column : atopTableHandle.getTable().getColumns()) {
            columnHandles.put(column.getName(), new AtopColumnHandle(column.getName()));
        }
        return columnHandles.build();
    }