Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1238#discussion_r14683319
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -26,6 +26,18 @@ import org.apache.spark.sql.catalyst.trees
abstract class LogicalPlan extends QueryPlan[LogicalPlan] {
self: Product =>
+ protected class Estimates {
+ lazy val childrenEstimations = children.map(_.estimates)
+ lazy val cardinality: Long = childrenEstimations.map(_.cardinality).sum
--- End diff --
We should rename cardinality because it can be ambiguous in databases. In
some context cardinality means "numTuples", and in other cases people use it
for "number of distinct values".
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