Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/1797#discussion_r56304469
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/rules/FlinkRuleSets.scala
---
@@ -29,50 +29,45 @@ object FlinkRuleSets {
*/
val DATASET_OPT_RULES: RuleSet = RuleSets.ofList(
- // filter rules
+ // push a filter into a join
FilterJoinRule.FILTER_ON_JOIN,
+ // push filter into the children of a join
FilterJoinRule.JOIN,
- FilterMergeRule.INSTANCE,
- FilterAggregateTransposeRule.INSTANCE,
+ // push filter through an aggregation
+ FlinkFilterAggregateTransposeRule.INSTANCE,
- // push and merge projection rules
+ // aggregation and projection rules
AggregateProjectMergeRule.INSTANCE,
- ProjectMergeRule.INSTANCE,
+ AggregateProjectPullUpConstantsRule.INSTANCE,
+ // push a projection past a filter or vice versa
ProjectFilterTransposeRule.INSTANCE,
FilterProjectTransposeRule.INSTANCE,
- AggregateProjectPullUpConstantsRule.INSTANCE,
- JoinPushExpressionsRule.INSTANCE,
+ // push a projection to the children of a join
ProjectJoinTransposeRule.INSTANCE,
+ // remove identity project
ProjectRemoveRule.INSTANCE,
+ // reorder sort and projection
SortProjectTransposeRule.INSTANCE,
ProjectSortTransposeRule.INSTANCE,
- // merge and push unions rules
- // TODO: Add a rule to enforce binary unions
+ // join rules
+ JoinPushExpressionsRule.INSTANCE,
+
+ // remove union with only a single child
UnionEliminatorRule.INSTANCE,
- FlinkJoinUnionTransposeRule.LEFT_UNION,
- FlinkJoinUnionTransposeRule.RIGHT_UNION,
--- End diff --
Why did you remove these 2?
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