If possible read families from tables and (more important) qualifiers?

[Andrzej]

I get:
return result->Value(family, qualifier).value()
result is optional, OK - it works.
But sometimes I must read unknown structure of table, or more often, I 
know families but I don't know qualifiers.

P.S. At long last I succeed building HBase client out of Docker, 
probably I can even write shared library encapsulated HBase client to 
external program.