old_contents: from .deprecated import QuestionMeta, FormQuestionSchema
  from .new import (
      ExportItem,
      ExportColumn,
      RowNumberColumn,
      StockExportColumn,
      ExportRow,
      ExportInstance,
      FormExportInstance,
      CaseExportInstance,
      ExportDataSchema,
      FormExportDataSchema,
      CaseExportDataSchema,
      ExportGroupSchema,
      TableConfiguration,
      ScalarItem,
      Option,
      MultipleChoiceItem,
      PathNode,
      MAIN_TABLE,
      CASE_HISTORY_TABLE,
      PARENT_CASE_TABLE,
  )
  
new_contents: from .deprecated import QuestionMeta, FormQuestionSchema
  from .new import (
      ExportItem,
      ExportColumn,
      RowNumberColumn,
      SplitExportColumn,
      StockExportColumn,
      ExportRow,
      ExportInstance,
      FormExportInstance,
      CaseExportInstance,
      ExportDataSchema,
      FormExportDataSchema,
      CaseExportDataSchema,
      ExportGroupSchema,
      TableConfiguration,
      ScalarItem,
      Option,
      MultipleChoiceItem,
      PathNode,
      MAIN_TABLE,
      CASE_HISTORY_TABLE,
      PARENT_CASE_TABLE,
  )
  
subject: add SplitExportColumn to __init__