Dgraph DQL Tour
Var Blocks
Value variables: filtering and ordering
If the context provided by the UIDs of the block is correct, value variables can also be used in filtering and ordering.
Here, ID will be the UID’s of all directors of name Steven and average is a
map from those UID’s to the average for each director. The filtering, ordering
and result for var(average) are evaluated in that context to obtain each
value.
A value variable can be used in place of a UID variable, uid(<value-variable>)
evaluates to the UID’s in the map. For example, the avs query block could be
written:
avs(func: uid(average), orderdesc: val(average)) @filter(ge(val(average), 40)) @normalize {