Add access methods

Author: GustavoAngulo

src/include/optimizer/optimizer.h

@@ -73,6 +73,14 @@ class Optimizer : public AbstractOptimizer {
 
   void Reset() override;
 
+  OptimizerMetadata &GetMetadata() { return metadata_; }
+
+  /* For test purposes only */
+  std::shared_ptr<GroupExpression> TestInsertQueryTree(parser::SQLStatement *tree,
+  concurrency::TransactionContext *txn) {
+    return InsertQueryTree(tree, txn);
+  }
+
  private:
   /* HandleDDLStatement - Check and handle DDL statment (currently only support
    *CREATE), set

src/include/optimizer/rule.h

@@ -146,6 +146,10 @@ class RuleSet {
     return rewrite_rules_map_[static_cast<uint32_t>(set)];
   }
 
+  std::unordered_map<uint32_t, std::vector<std::unique_ptr<Rule>>> &GetRewriteRulesMap() { return rewrite_rules_map_; }
+
+  std::vector<std::unique_ptr<Rule>> &GetPredicatePushDownRules() { return predicate_push_down_rules_; }
+
  private:
   std::vector<std::unique_ptr<Rule>> transformation_rules_;
   std::vector<std::unique_ptr<Rule>> implementation_rules_;