Drizzled Public API Documentation

rollup_const.h
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19 
20 #pragma once
21 
22 #include <drizzled/function/func.h>
23 
24 
25 namespace drizzled
26 {
27 
28 /*
29  Objects of this class are used for ROLLUP queries to wrap up
30  each constant item referred to in GROUP BY list.
31 */
32 
34 {
35 public:
37  {
38  name= a->name;
40  }
41  double val_real() { return args[0]->val_real(); }
42  int64_t val_int() { return args[0]->val_int(); }
43  String *val_str(String *str) { return args[0]->val_str(str); }
44  type::Decimal *val_decimal(type::Decimal *dec) { return args[0]->val_decimal(dec); }
45  const char *func_name() const { return "rollup_const"; }
46  bool const_item() const { return 0; }
47  Item_result result_type() const { return args[0]->result_type(); }
48  void fix_length_and_dec()
49  {
50  collation= args[0]->collation;
51  max_length= args[0]->max_length;
52  decimals=args[0]->decimals;
53  /* The item could be a NULL constant. */
54  null_value= args[0]->is_null();
55  }
56 };
57 
58 } /* namespace drizzled */
59 
const char * name
Definition: item.h:110
virtual bool is_null()
Definition: item.cc:513
virtual int64_t val_int()=0
bool null_value
Definition: item.h:122
virtual double val_real()=0
String * val_str(String *str)
Definition: rollup_const.h:43
virtual String * val_str(String *str)=0
type::Decimal * val_decimal(type::Decimal *dec)
Definition: rollup_const.h:44
uint32_t name_length
Definition: item.h:113
virtual type::Decimal * val_decimal(type::Decimal *decimal_buffer)=0