IndexLookup

class IndexLookup : PhysicalOperator (source)

Physical operator to lookup paths in the kPathIndex.

Let's say we've got this physical plan:

    INDEX_LOOKUP
      /  |  \
     a   b   c

Then a - b - c forms the labeled path for which we are searching for paths in de index.

IndexLookup(physicalPlan: PhysicalPlan)

Physical operator to lookup paths in the kPathIndex.

val physicalPlan: PhysicalPlan

The physical plan which holds the leafs which make up the pathId.

cardinality	`open val cardinality: Long` Delegate cardinality to the physical plan.
firstChild	`open val firstChild: PhysicalOperator` The first set of data to operate on.
lastChild	`open val lastChild: PhysicalOperator` The last set of data to operate on.

cost	`fun cost(): Long` Cost of an index lookup is very cheap.
evaluate	`fun evaluate(): PathStream` Evaluate the index lookup and stream the results.