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Merge of Monty

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drizzled/function/set_user_var.cc
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#include <drizzled/field/num.h>
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#include <drizzled/session.h>
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#include <bitset>
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using namespace std;
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/*
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  When a user variable is updated (in a SET command or a query like
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  SELECT @a:= ).
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  {
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    Table *table= (Table *) arg;
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    if (result_field->table == table || !table)
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      result_field->table->read_set->set(result_field->field_index);
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  }
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  return 0;
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}
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/*
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  Mark field in bitmap supplied as *arg
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*/
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bool Item_func_set_user_var::register_field_in_bitmap(unsigned char *arg)
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{
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  bitset<MAX_FIELDS> *bitmap = (bitset<MAX_FIELDS> *) arg;
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  assert(bitmap);
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  if (result_field)
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  {
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    bitmap->set(result_field->field_index);
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  }
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  return 0;
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}
 
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      result_field->table->setReadSet(result_field->field_index);
 
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  }
 
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  return 0;
 
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}
 
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bool
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Item_func_set_user_var::update_hash(void *ptr, uint32_t length,