Method Visit

cpp/src/gandiva/expr_decomposer.cc:39–51

Decompose a field node - simply separate out validity & value arrays.

// Decompose a field node - simply separate out validity & value arrays.
Status ExprDecomposer::Visit(const FieldNode& node) {
  auto desc = annotator_.CheckAndAddInputFieldDescriptor(node.field());

  DexPtr validity_dex = std::make_shared<VectorReadValidityDex>(desc);
  DexPtr value_dex;
  if (desc->HasOffsetsIdx()) {
    value_dex = std::make_shared<VectorReadVarLenValueDex>(desc);
  } else {
    value_dex = std::make_shared<VectorReadFixedLenValueDex>(desc);
  }
  result_ = std::make_shared<ValueValidityPair>(validity_dex, value_dex);
  return Status::OK();
}

// Try and optimize a function node, by substituting with cheaper alternatives.
// eg. replacing 'like' with 'starts_with' can save function calls at evaluation