presto-tpcds/src/main/java/io/prestosql/plugin/tpcds/TpcdsMetadata.java/TpcdsMetadata/getColumnHandles
class TpcdsMetadata:    @Override
    public Map<String, ColumnHandle> getColumnHandles(ConnectorSession session, ConnectorTableHandle tableHandle)
    {
        ImmutableMap.Builder<String, ColumnHandle> builder = ImmutableMap.builder();
        for (ColumnMetadata columnMetadata : getTableMetadata(session, tableHandle).getColumns()) {
            builder.put(columnMetadata.getName(), new TpcdsColumnHandle(columnMetadata.getName(), columnMetadata.getType()));
        }
        return builder.build();
    }