Method evaluate

bolt/expression/Expr.cpp:2081–2089

    const std::string& currentSplitStr) {
  EvalCtx context(ensureExecCtx(), exprSet, &input, currentSplitStr);
  std::vector<VectorPtr> results = {std::move(result)};
  exprSet->eval(0, 1, true, rows, context, results);
  result = std::move(results[0]);
}

core::ExecCtx* SimpleExpressionEvaluator::ensureExecCtx() {
  if (!execCtx_) {
    execCtx_ = std::make_unique<core::ExecCtx>(pool_, queryCtx_);
  }
  return execCtx_.get();
}