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  • Committer: Monty Taylor
  • Date: 2010-10-19 21:51:42 UTC
  • mto: This revision was merged to the branch mainline in revision 1870.
  • Revision ID: mordred@inaugust.com-20101019215142-bwof1oqrswj9ms3v
Add a constrained_value class which allows us to set compile-time
constraints on a value.

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Lines of Context:
drizzled/item/field.cc
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{
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  Table *table= (Table *) arg;
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  if (field->getTable() == table || !table)
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    field->getTable()->setReadSet(field->position());
 
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    field->getTable()->setReadSet(field->field_index);
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  return 0;
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}
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  switch (result_field->result_type()) {
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  case INT_RESULT:
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    return result_field->val_int() != 0;
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  case DECIMAL_RESULT:
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    {
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      my_decimal decimal_value;
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      my_decimal *val= result_field->val_decimal(&decimal_value);
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      if (val)
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        return !my_decimal_is_zero(val);
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      return 0;
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    }
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  {
 
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    my_decimal decimal_value;
 
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    my_decimal *val= result_field->val_decimal(&decimal_value);
 
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    if (val)
 
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      return !my_decimal_is_zero(val);
 
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    return 0;
 
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  }
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  case REAL_RESULT:
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  case STRING_RESULT:
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    return result_field->val_real() != 0.0;
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  case ROW_RESULT:
 
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  default:
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    assert(0);
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    return 0;                                   // Shut up compiler
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  }
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  assert(0);
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  return 0;                                   // Shut up compiler
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}
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    {
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      Item_ref *rf;
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      rf= new Item_ref(context,
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                       (cached_table->getSchemaName()[0] ? cached_table->getSchemaName() : 0),
 
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                       (cached_table->db[0] ? cached_table->db : 0),
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                       (char*) cached_table->alias, (char*) field_name);
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      if (!rf)
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        return -1;
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      current_bitmap= table->write_set;
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      other_bitmap=   table->read_set;
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    }
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    //if (! current_bitmap->testAndSet(field->position()))
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    if (! current_bitmap->test(field->position()))
 
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    //if (! current_bitmap->testAndSet(field->field_index))
 
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    if (! current_bitmap->test(field->field_index))
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    {
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      if (! other_bitmap->test(field->position()))
 
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      if (! other_bitmap->test(field->field_index))
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      {
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        /* First usage of column */
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        table->used_fields++;                     // Used to optimize loops
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  {
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    char buff[MAX_FIELD_WIDTH];
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    String tmp(buff,sizeof(buff),str->charset());
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    field->val_str_internal(&tmp);
 
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    field->val_str(&tmp);
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    if (field->is_null())  {
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      str->append("NULL");
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    }