Returns true if expr
can be evaluated using only the output of plan
.
Returns true if expr
can be evaluated using only the output of plan
. This method
can be used to determine when it is acceptable to move expression evaluation within a query
plan.
For example consider a join between two relations R(a, b) and S(c, d).
- canEvaluate(EqualTo(a,b), R)
returns true
- canEvaluate(EqualTo(a,c), R)
returns false
- canEvaluate(Literal(1), R)
returns true
as literals CAN be evaluated on any plan
Returns true iff expr
could be evaluated as a condition within join.
Returns true iff expr
could be evaluated as a condition within join.
This we have to copy from spark patterns.scala because we want handle single table with filters as well.
This will have another advantage later if we decide to move our rule to the last instead of injecting just after ReorderJoin, whereby additional nodes like Project requires handling.