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New merge for TableShare

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drizzled/item/empty_string.h
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#include <drizzled/item/string.h>
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namespace drizzled
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{
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class Item_empty_string :public Item_string
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{
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public:
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  Item_empty_string(const char *header,uint32_t length, const CHARSET_INFO * cs= NULL) :
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    Item_string("",0, cs ? cs : &my_charset_utf8_general_ci)
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    { name= const_cast<char*>(header); max_length= cs ? length * cs->mbmaxlen : length; }
 
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    { name=(char*) header; max_length= cs ? length * cs->mbmaxlen : length; }
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  void make_field(SendField *field);
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};
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} /* namespace drizzled */
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#endif /* DRIZZLED_ITEM_EMPTY_STRING_H */