Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7773#discussion_r35921821
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/physical/partitioning.scala
---
@@ -94,8 +95,12 @@ sealed trait Partitioning {
*/
def compatibleWith(other: Partitioning): 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]]
--- End diff --
One clarification: how does this property differ from `compatibleWith`? I
just want to better understand the precise relationships between `satisfies`,
`compatibleWith`, and `guarantees`.
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