Function nth_varbinary_offset_and_length

cpp/src/arrow/compute/row/row_internal.h:135–145

Returns the offset within the row and length of the second and further varbinary fields.

  /// Returns the offset within the row and length of the second and further varbinary
  /// fields.
  inline void nth_varbinary_offset_and_length(const uint8_t* row, int varbinary_id,
                                              uint32_t* out_offset,
                                              uint32_t* out_length) const {
    ARROW_DCHECK(!is_fixed_length);
    ARROW_DCHECK(varbinary_id > 0);
    const uint32_t* varbinary_end = varbinary_end_array(row);
    uint32_t offset = varbinary_end[varbinary_id - 1];
    offset += padding_for_alignment_within_row(offset, string_alignment);
    *out_offset = offset;
    *out_length = varbinary_end[varbinary_id] - offset;
  }

  uint32_t encoded_field_order(uint32_t icol) const { return column_order[icol]; }