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drizzled/item/default_value.cc
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  Item *new_item= arg->transform(transformer, args);
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  if (!new_item)
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    return NULL;
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  /*
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    Session::change_item_tree() should be called only if the tree was
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    really transformed, i.e. when a new item has been created.
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    Otherwise we'll be allocating a lot of unnecessary memory for
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    change records at each execution.
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  */
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  if (arg != new_item)
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    getSession().change_item_tree(&arg, new_item);
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  arg= new_item;
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  return (this->*transformer)(args);
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}
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