Github user jianqiao commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/73#discussion_r73204750
--- Diff: query_optimizer/rules/BottomUpRule.hpp ---
@@ -80,6 +81,8 @@ class BottomUpRule : public Rule<TreeType> {
*/
virtual TreeNodePtr applyToNode(const TreeNodePtr &node) = 0;
+ virtual void init(const TreeNodePtr &node) = 0;
--- End diff --
Let's provide a default no-op implementation for `init()` here (instead of
pure virtual) so we don't have to implement it for every subclass.
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