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drizzled/cached_item.cc
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  Create right type of Cached_item for an item.
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*/
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Cached_item *new_Cached_item(Session *session, Item *item,
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                             bool use_result_field)
 
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Cached_item *new_Cached_item(Session *session, Item *item)
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{
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  if (item->real_item()->type() == Item::FIELD_ITEM &&
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      !(((Item_field *) (item->real_item()))->field->flags & BLOB_FLAG))
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  {
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    Item_field *real_item= (Item_field *) item->real_item();
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    Field *cached_field= use_result_field ? real_item->result_field :
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                                            real_item->field;
 
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    Field *cached_field= real_item->field;
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    return new Cached_item_field(cached_field);
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  }
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  switch (item->result_type()) {