rubenada commented on a change in pull request #1309: [CALCITE-3183] Trimming
method for Filter rel uses wrong traitSet
URL: https://github.com/apache/calcite/pull/1309#discussion_r301435477
##########
File path: core/src/main/java/org/apache/calcite/rel/core/RelFactories.java
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@@ -303,6 +303,10 @@ public RelNode createAggregate(RelNode input,
public interface FilterFactory {
/** Creates a filter. */
RelNode createFilter(RelNode input, RexNode condition);
+
+ /** Creates a filter. */
+ RelNode createFilter(RelNode input, RexNode condition,
Review comment:
I'm not sure if this is "public API" or not, but if it is, this will be a
"breaking change". Should it be documented somewhere? Another alternative could
be providing a default implementation for the new method (which just ignores
the CorrelationId set):
```
default RelNode createFilter(RelNode input, RexNode condition,
ImmutableSet<CorrelationId> variablesSet) {
return createFilter(input, condition);
}
```
This approach will not break any existing implementation of `FilterFactory`,
e.g. this patch would not need to modify `PigRelFactories.java`.
I'm not against the current solution, but I thought it might be worth it to
discuss this other alternative.
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