Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7773#discussion_r36036422
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala
---
@@ -86,8 +87,12 @@ sealed trait Partitioning {
*/
def satisfies(required: Distribution): Boolean
- /** Returns the expressions that are used to key the partitioning. */
- def keyExpressions: Seq[Expression]
+ /**
+ * Returns true iff we can say that the partitioning scheme of this
[[Partitioning]]
+ * guarantees the same partitioning scheme described by `other`.
+ */
+ // TODO: Add an example once we have the `nullSafe` concept.
+ def guarantees(other: Partitioning): Boolean
--- End diff --
I think that we should only consider a name like `semanticEqual` or
`semanticEquiv` if `a.guarantees(b)` implies `b.guarantees(a)` and vice-versa.
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