SelectionQueryImpl should support buildQueryString

If I want to create a query using dynamic selections, for example say from UI we received a request for aggregate function
List functions; which as max,min for columns "test1". This list of functions can be dynamic. Now I cannot use query build to build a query dynamically. SelectionQueryImpl can be used but this cannot generate a string, Is there a work around? or is there a way that i can build select query dynamically when using aggregate functions?

SelectionQueryImpl selection= select();
selection.column(searchFilter.getName().get(0)).function(searchFilter.getFunctions().get(0).toString());
selection.function("mean", searchFilter.getName().get(0));
selection.function("min", searchFilter.getName().get(0));
selection.from(bucket,(ObjectUtils.isNotEmpty(searchFilter.getType()))? searchFilter.getType().stream().toArray(String[]::new): new String[0]);

Inizia individuando SelectionQueryImpl e le API esistenti per la costruzione delle query che utilizza. Determina l’output previsto della stringa di query per le funzioni aggregate dinamiche, quindi verifica che SelectionQueryImpl possa produrlo con test che coprano il pattern di selezione mostrato.