Function pullUpExtends

pullUpExtends<T extends Operation>(c: TransformationContext, op: T): T
Floats every BIND in op as high as the plan allows and deletes the ones nothing above reads.

Works on a subtree as happily as on a whole query, the invariant being anchored per swap.
Type Parameters
- T extends Operation
Parameters
- c: TransformationContext
  The transformation context
- op: T
  The operation to rewrite
Returns T
the rewritten operation
Example
```
// Before: SELECT * WHERE { { ?s ?p ?o . BIND(<ex://a> AS ?x) } { ?a ?b ?c } }
// After:  SELECT * WHERE { ?s ?p ?o . ?a ?b ?c . BIND(<ex://a> AS ?x) }
```
Example
```
// Before: SELECT ?y WHERE { ?y <ex://p> ?o . BIND(<ex://a> AS ?x) }
// After (nothing projects ?x, so the bind is deleted):
// SELECT ?y WHERE { ?y <ex://p> ?o }
```
- Defined in lib/transformations/pullUpExtends.ts:174