Method ensureFieldLoaded

bolt/expression/EvalCtx.cpp:316–343

}

VectorPtr EvalCtx::ensureFieldLoaded(
    int32_t index,
    const SelectivityVector& rows) {
  auto field = getField(index);
  if (isLazyNotLoaded(*field)) {
    const auto& rowsToLoad = isFinalSelection_ ? rows : *finalSelection_;

    LocalDecodedVector holder(*this);
    auto decoded = holder.get();
    LocalSelectivityVector baseRowsHolder(*this, 0);
    auto baseRows = baseRowsHolder.get();
    auto rawField = field.get();
    LazyVector::ensureLoadedRows(field, rowsToLoad, *decoded, *baseRows);
    if (rawField != field.get()) {
      if (peeledFields_.empty()) {
        const_cast<RowVector*>(row_)->childAt(index) = field;
      } else {
        peeledFields_[index] = field;
      }
    }
  } else {
    // This is needed in any case because wrappers must be initialized also if
    // they contain a loaded lazyVector.
    field->loadedVector();
  }

  return field;
}

// Utility function used to extend the size of a complex Vector by wrapping it
// in a dictionary with identity mapping for existing rows.