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

    https://github.com/apache/incubator-quickstep/pull/237#discussion_r113066931
  
    --- Diff: expressions/scalar/ScalarCaseExpression.cpp ---
    @@ -420,15 +429,15 @@ void 
ScalarCaseExpression::MultiplexNativeColumnVector(
     void ScalarCaseExpression::MultiplexIndirectColumnVector(
         const TupleIdSequence *source_sequence,
         const TupleIdSequence &case_matches,
    -    IndirectColumnVector *case_result,
    +    const IndirectColumnVector &case_result,
         IndirectColumnVector *output) {
       if (source_sequence == nullptr) {
         TupleIdSequence::const_iterator output_pos_it = case_matches.begin();
         for (std::size_t input_pos = 0;
    -         input_pos < case_result->size();
    +         input_pos < case_result.size();
              ++input_pos, ++output_pos_it) {
           output->positionalWriteTypedValue(*output_pos_it,
    -                                        
case_result->moveTypedValue(input_pos));
    --- End diff --
    
    `moveTypedValue ` still makes sense as a public method that might be used 
in the future.


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