Method createRowBatch

c++/src/Reader.cc:1464–1484

  }

  std::unique_ptr<ColumnVectorBatch> RowReaderImpl::createRowBatch(uint64_t capacity) const {
    // If the read type is specified, then check that the selected schema matches the read type
    // on the first call to createRowBatch.
    if (schemaEvolution_.getReadType() && selectedSchema_.get() == nullptr) {
      auto fileSchema = &getSelectedType();
      auto readType = schemaEvolution_.getReadType();
      std::set<uint64_t> readColumns, fileColumns;
      getColumnIds(readType, readColumns);
      getColumnIds(fileSchema, fileColumns);
      if (readColumns != fileColumns) {
        std::ostringstream ss;
        ss << "The selected schema " << fileSchema->toString() << " doesn't match read type "
           << readType->toString();
        throw SchemaEvolutionError(ss.str());
      }
    }
    const Type& readType =
        schemaEvolution_.getReadType() ? *schemaEvolution_.getReadType() : getSelectedType();
    return readType.createRowBatch(capacity, *contents_->pool, enableEncodedBlock_,
                                   useTightNumericVector_);
  }

  void ensureOrcFooter(InputStream* stream, DataBuffer<char>* buffer, uint64_t postscriptLength) {
    const std::string MAGIC("ORC");