org.apache.spark.sql.catalyst.planning
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
Flatten all inner joins, which are next to each other.
Flatten all inner joins, which are next to each other. Return a list of logical plans to be joined with a boolean for each plan indicating if it was involved in an explicit cross join. Also returns the entire list of join conditions for the left-deep tree.
A pattern that collects the filter and inner joins.
Filter | inner Join / \ ----> (Seq(plan0, plan1, plan2), conditions) Filter plan2 | inner join / \ plan0 plan1
Note: This pattern currently only works for left-deep trees.