Aggregation functions support

Read all client documents. Looked at the implementation of "facet" in the code. Am I right in thinking that there is no such functionality? For example "MIN" or "MAX"?
It after all as not simply to create sql. Worry about escaping field names or something else.
Or is there still some way to use the same "searchclass" SQL ?

Start by reviewing the client documentation and the implementation of "facet" mentioned in the issue. Determine whether aggregation functions such as MIN and MAX are supported through the client or searchclass SQL, and identify the expected handling of field-name escaping. Done means the supported approach or required API behavior is clearly established and covered by the appropriate client changes and tests.

Written by the indexing model from the issue text.