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MDEV-12707 Split resolve_const_item() into virtual methods in Type_handler

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This commit is contained in:
Alexander Barkov
2017-05-06 00:04:15 +04:00
parent ac53b49b1b
commit 26fa7232cf
7 changed files with 234 additions and 170 deletions
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34
sql/sql_type.h
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@ -746,6 +746,26 @@ public:
virtual bool
subquery_type_allows_materialization(const Item *inner,
const Item *outer) const= 0;
/**
Make a simple constant replacement item for a constant "src",
so the new item can futher be used for comparison with "cmp", e.g.:
src = cmp -> replacement = cmp
"this" is the type handler that is used to compare "src" and "cmp".
@param thd - current thread, for mem_root
@param src - The item that we want to replace. It's a const item,
but it can be complex enough to calculate on every row.
@param cmp - The src's comparand.
@retval - a pointer to the created replacement Item
@retval - NULL, if could not create a replacement (e.g. on EOM).
NULL is also returned for ROWs, because instead of replacing
a Item_row to a new Item_row, Type_handler_row just replaces
its elements.
*/
virtual Item *make_const_item_for_comparison(THD *thd,
Item *src,
Item *cmp) const= 0;
virtual Item_cache *Item_get_cache(THD *thd, const Item *item) const= 0;
virtual bool set_comparator_func(Arg_comparator *cmp) const= 0;
virtual bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
@ -935,6 +955,7 @@ public:
DBUG_ASSERT(0);
return false;
}
Item *make_const_item_for_comparison(THD *thd, Item *src, Item *cmp) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
@ -1137,6 +1158,7 @@ public:
SORT_FIELD_ATTR *attr) const;
bool Item_save_in_value(Item *item, st_value *value) const;
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
Item *make_const_item_for_comparison(THD *thd, Item *src, Item *cmp) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
@ -1201,6 +1223,7 @@ public:
return Item_send_str(item, protocol, buf);
}
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
Item *make_const_item_for_comparison(THD *thd, Item *src, Item *cmp) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
@ -1257,6 +1280,7 @@ public:
SORT_FIELD_ATTR *attr) const;
bool Item_save_in_value(Item *item, st_value *value) const;
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
Item *make_const_item_for_comparison(THD *thd, Item *src, Item *cmp) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
@ -1318,7 +1342,6 @@ public:
bool subquery_type_allows_materialization(const Item *inner,
const Item *outer) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const;
bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
@ -1401,6 +1424,7 @@ public:
Item *source_expr, Item *source_const) const;
bool subquery_type_allows_materialization(const Item *inner,
const Item *outer) const;
Item *make_const_item_for_comparison(THD *thd, Item *src, Item *cmp) const;
Item_cache *Item_get_cache(THD *thd, const Item *item) const;
bool set_comparator_func(Arg_comparator *cmp) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
@ -1693,6 +1717,8 @@ public:
String *print_item_value(THD *thd, Item *item, String *str) const;
bool Item_hybrid_func_fix_attributes(THD *thd, Item_hybrid_func *func,
Item **items, uint nitems) const;
Item *make_const_item_for_comparison(THD *thd, Item *src, Item *cmp) const;
bool set_comparator_func(Arg_comparator *cmp) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
};
@ -1729,13 +1755,14 @@ class Type_handler_temporal_with_date: public Type_handler_temporal_result
{
public:
virtual ~Type_handler_temporal_with_date() {}
const Type_handler *type_handler_for_comparison() const;
bool Item_save_in_value(Item *item, st_value *value) const;
bool Item_send(Item *item, Protocol *protocol, st_value *buf) const
{
return Item_send_date(item, protocol, buf);
}
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
Item *make_const_item_for_comparison(THD *thd, Item *src, Item *cmp) const;
bool set_comparator_func(Arg_comparator *cmp) const;
cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const;
in_vector *make_in_vector(THD *, const Item_func_in *, uint nargs) const;
};
@ -1747,6 +1774,7 @@ class Type_handler_date_common: public Type_handler_temporal_with_date
public:
virtual ~Type_handler_date_common() {}
const Name name() const { return m_name_date; }
const Type_handler *type_handler_for_comparison() const;
enum_field_types field_type() const { return MYSQL_TYPE_DATE; }
enum_mysql_timestamp_type mysql_timestamp_type() const
{
@ -1790,6 +1818,7 @@ class Type_handler_datetime_common: public Type_handler_temporal_with_date
public:
virtual ~Type_handler_datetime_common() {}
const Name name() const { return m_name_datetime; }
const Type_handler *type_handler_for_comparison() const;
enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
enum_mysql_timestamp_type mysql_timestamp_type() const
{
@ -1846,6 +1875,7 @@ class Type_handler_timestamp_common: public Type_handler_temporal_with_date
public:
virtual ~Type_handler_timestamp_common() {}
const Name name() const { return m_name_timestamp; }
const Type_handler *type_handler_for_comparison() const;
enum_field_types field_type() const { return MYSQL_TYPE_TIMESTAMP; }
enum_mysql_timestamp_type mysql_timestamp_type() const
{