Github user zuyu commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/237#discussion_r112847711
  
    --- Diff: query_optimizer/expressions/SimpleCase.cpp ---
    @@ -161,6 +163,50 @@ ::quickstep::Scalar* SimpleCase::concretize(
           else_result_expression.release());
     }
     
    +std::size_t SimpleCase::computeHash() const {
    +  std::size_t hash_code =
    +      CombineHashes(static_cast<std::size_t>(ExpressionType::kSimpleCase),
    +                    case_operand_->hash());
    +  for (std::size_t i = 0; i < condition_operands_.size(); ++i) {
    +    hash_code = CombineHashes(hash_code, condition_operands_[i]->hash());
    +    hash_code = CombineHashes(hash_code, 
conditional_result_expressions_[i]->hash());
    +  }
    +  if (else_result_expression_ != nullptr) {
    +    hash_code = CombineHashes(hash_code, else_result_expression_->hash());
    +  }
    +  return hash_code;
    +}
    +
    +bool SimpleCase::equals(const ScalarPtr &other) const {
    +  SimpleCasePtr expr;
    +  if (!SomeSimpleCase::MatchesWithConditionalCast(other, &expr)) {
    +    return false;
    +  }
    +  if (!case_operand_->equals(expr->case_operand_)) {
    +    return false;
    +  }
    +  if (condition_operands_.size() != expr->condition_operands_.size()) {
    +    return false;
    +  }
    +  for (std::size_t i = 0; i < condition_operands_.size(); ++i) {
    +    if (!condition_operands_[i]->equals(expr->condition_operands_[i])
    +        || !conditional_result_expressions_[i]->equals(
    +                expr->conditional_result_expressions_[i])) {
    +      return false;
    +    }
    +  }
    +  if ((else_result_expression_ == nullptr
    +       || expr->else_result_expression_ == nullptr)
    --- End diff --
    
    Please add four whitespace indentations.
    
    Actually, to be consistent with other bool expression usages, I recommend 
to refactor as following:
    
    ```
      if ((else_result_expression_ == nullptr ||
               expr->else_result_expression_ == nullptr)) &&
          else_result_expression_ != expr->else_result_expression_) {
      ...
    }
    ```


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