Database : literature
Restore  : NO

Operator : feed
Number   : 1
Signature: nrel(tuple(x)) -> stream(tuple(x))
Example  : query Papers feed count
Result   : 1238

Operator : consume 
Number   : 1
Signature: (stream(tuple(x)) -> nrel(tuple(x))
Example  : query Papers feed head [1] project [Authors] consume
Result   : ((nrel(tuple((Authors (arel(tuple((Name string))))))))(((0 ("Zhong Li") ("Jianping Fan")))))

Operator : afeed
Number   : 1
Signature: arel(tuple(x)) -> stream(tuple(x))
Example  : query authordoc feed head [1000] filter [.Details afeed count > 1] count
Result   : 363

Operator : aconsume
Number   : 1
Signature: stream(tuple(x))  -> arel(tuple(x))
Example  : query Papers feed extend [Pub_with_B: .Authors afeed filter [.Name contains "B"] aconsume] count
Result   : 1238

Operator : nest
Number   : 1
Signature: stream(tuple(x)) x (attribute_name)* x attribute_name -> stream(tuple(y))
Example  : query document feed head [10000] nest [Docid; Details] count
Result   : 5662

Operator : unnest
Number   : 1
Signature: stream(tuple(x)) x attribute-> stream(tuple(y))
Example  : query Papers feed unnest [Authors] count
Result   : 3745

Operator : rename
Number   : 1
Signature: ((stream (tuple([a1:d1, ... ,an:dn)))ar) -> (stream (tuple([a1ar:d1, ... ,anar:dn)))
Example  : query Papers feed rename[t1] count
Result   : 1238
         
Operator : extract
Number   : 1
Signature: ((stream (tuple([a1:d1, ... ,an:dn]))) x ai) -> rel(x) or nrel(x)
Example  : query Papers feed extract [Title] feed count
Result   : 1


Operator : gettuples
Number   : 1
Signature: stream(tuple (A) ) x nrel(tuple(B) ) -> stream(tuple ( A \ a_tid  B))
Example  : query authordoc_Name_btree exactmatchS["Alejandro Munoz"] authordoc gettuples count
Result   : 1

Operator : count
Number   : 1
Signature : nrel -> int
Example   : query (Papers feed count) = (Papers count)
Result    : TRUE