Simple predicate evaluation conumes 38 instructions per row with codegen enabled

    if (has_conjuncts && !ExecNode::EvalConjuncts(
        conjunct_ctxs, num_conjuncts, reinterpret_cast<TupleRow*>(output_row))) {
      continue;
    }

bool ExecNode::EvalConjuncts(ExprContext* const* ctxs, int num_ctxs, TupleRow* row) {
  for (int i = 0; i < num_ctxs; ++i) {
    BooleanVal v = ctxs[i]->GetBooleanVal(row);
    if (v.is_null || !v.val) return false;
  }
  return true;
}

select count(*) from lineitem where l_orderkey  = 1;

impalad ! impala::ScalarFnCall::GetBooleanVal - scalar-fn-call.cc
impalad ! impala::ExprContext::GetBooleanVal + 0x16 - expr-context.cc:342
impalad ! impala::ExecNode::EvalConjuncts + 0x39 - exec-node.cc:442
impalad ! impala::HdfsParquetScanner::TransferScratchTuples + 0x203 - hdfs-parquet-scanner.cc:1973
impalad ! impala::HdfsParquetScanner::AssembleRows + 0x244 - hdfs-parquet-scanner.cc:2087
impalad ! impala::HdfsParquetScanner::ProcessSplit + 0x4e9 - hdfs-parquet-scanner.cc:1893
impalad ! impala::HdfsScanNode::ProcessSplit + 0x3a5 - hdfs-scan-node.cc:1198
impalad ! impala::HdfsScanNode::ScannerThread + 0xcad - hdfs-scan-node.cc:1076
impalad ! impala::Thread::SuperviseThread + 0x226 - thread.cc:315
impalad ! boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(std::string const&, std::string const&, boost::function<void (void)>, impala::Promise<long>*), boost::_bi::list4<boost::_bi::value<std::string>, boost::_bi::value<std::string>, boost::_bi::value<boost::function<void (void)>>, boost::_bi::value<impala::Promise<long>*>>>>::run + 0x73 - thread.hpp:116
impalad ! thread_proxy + 0xd9 - [unknown source file]
libpthread-2.12.so ! start_thread + 0xd0 - [unknown source file]
libc-2.12.so ! clone + 0x6c - [unknown source file]