srowen closed pull request #23273: [MINOR][DOC] Fix comments of
ConvertToLocalRelation rule
URL: https://github.com/apache/spark/pull/23273
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diff --git
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
index 8d251eeab8484..f615757a837a1 100644
---
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
+++
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
@@ -131,11 +131,11 @@ abstract class Optimizer(sessionCatalog: SessionCatalog)
// since the other rules might make two separate Unions operators
adjacent.
Batch("Union", Once,
CombineUnions) ::
- // run this once earlier. this might simplify the plan and reduce cost of
optimizer.
- // for example, a query such as Filter(LocalRelation) would go through all
the heavy
+ // Run this once earlier. This might simplify the plan and reduce cost of
optimizer.
+ // For example, a query such as Filter(LocalRelation) would go through all
the heavy
// optimizer rules that are triggered when there is a filter
- // (e.g. InferFiltersFromConstraints). if we run this batch earlier, the
query becomes just
- // LocalRelation and does not trigger many rules
+ // (e.g. InferFiltersFromConstraints). If we run this batch earlier, the
query becomes just
+ // LocalRelation and does not trigger many rules.
Batch("LocalRelation early", fixedPoint,
ConvertToLocalRelation,
PropagateEmptyRelation) ::
@@ -1370,10 +1370,8 @@ object DecimalAggregates extends Rule[LogicalPlan] {
}
/**
- * Converts local operations (i.e. ones that don't require data exchange) on
LocalRelation to
- * another LocalRelation.
- *
- * This is relatively simple as it currently handles only 2 single case:
Project and Limit.
+ * Converts local operations (i.e. ones that don't require data exchange) on
`LocalRelation` to
+ * another `LocalRelation`.
*/
object ConvertToLocalRelation extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transform {
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