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Give store_for_compare a more meaningful name, cleanup and comment the

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call.


sql/item_cmpfunc.cc:
  Rename: Field::store_for_compare -> Field::can_be_compared_as_longlong
This commit is contained in:
unknown 2004-09-28 15:29:38 +04:00
commit 9131bd2404
2 changed files with 18 additions and 11 deletions
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23
sql/field.h
View file

@ -179,7 +179,14 @@ public:
virtual void make_field(Send_field *)=0;
virtual void sort_string(char *buff,uint length)=0;
virtual bool optimize_range(uint idx, uint part);
virtual bool store_for_compare() { return 0; }
/*
This should be true for fields which, when compared with constant
items, can be casted to longlong. In this case we will at 'fix_fields'
stage cast the constant items to longlongs and at the execution stage
use field->val_int() for comparison. Used to optimize clauses like
'a_column BETWEEN date_const, date_const'.
*/
virtual bool can_be_compared_as_longlong() const { return FALSE; }
virtual void free() {}
Field *new_field(MEM_ROOT *root, struct st_table *new_table)
{
@ -566,7 +573,7 @@ public:
void sort_string(char *buff,uint length);
uint32 pack_length() const { return 8; }
void sql_type(String &str) const;
bool store_for_compare() { return 1; }
bool can_be_compared_as_longlong() const { return TRUE; }
uint32 max_length() { return 20; }
field_cast_enum field_cast_type() { return FIELD_CAST_LONGLONG; }
};
@ -694,7 +701,7 @@ public:
void sort_string(char *buff,uint length);
uint32 pack_length() const { return 4; }
void sql_type(String &str) const;
bool store_for_compare() { return 1; }
bool can_be_compared_as_longlong() const { return TRUE; }
bool zero_pack() const { return 0; }
void set_time();
virtual void set_default()
@ -740,7 +747,7 @@ public:
String *val_str(String*,String *);
bool send_binary(Protocol *protocol);
void sql_type(String &str) const;
bool store_for_compare() { return 1; }
bool can_be_compared_as_longlong() const { return TRUE; }
field_cast_enum field_cast_type() { return FIELD_CAST_YEAR; }
};
@ -772,7 +779,7 @@ public:
void sort_string(char *buff,uint length);
uint32 pack_length() const { return 4; }
void sql_type(String &str) const;
bool store_for_compare() { return 1; }
bool can_be_compared_as_longlong() const { return TRUE; }
bool zero_pack() const { return 1; }
field_cast_enum field_cast_type() { return FIELD_CAST_DATE; }
};
@ -802,7 +809,7 @@ public:
void sort_string(char *buff,uint length);
uint32 pack_length() const { return 3; }
void sql_type(String &str) const;
bool store_for_compare() { return 1; }
bool can_be_compared_as_longlong() const { return TRUE; }
bool zero_pack() const { return 1; }
bool get_date(TIME *ltime,uint fuzzydate);
bool get_time(TIME *ltime);
@ -839,7 +846,7 @@ public:
void sort_string(char *buff,uint length);
uint32 pack_length() const { return 3; }
void sql_type(String &str) const;
bool store_for_compare() { return 1; }
bool can_be_compared_as_longlong() const { return TRUE; }
bool zero_pack() const { return 1; }
field_cast_enum field_cast_type() { return FIELD_CAST_TIME; }
};
@ -875,7 +882,7 @@ public:
void sort_string(char *buff,uint length);
uint32 pack_length() const { return 8; }
void sql_type(String &str) const;
bool store_for_compare() { return 1; }
bool can_be_compared_as_longlong() const { return TRUE; }
bool zero_pack() const { return 1; }
bool get_date(TIME *ltime,uint fuzzydate);
bool get_time(TIME *ltime);