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cleanup: remove get_datetime_value()

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This commit is contained in:
Sergei Golubchik 2018-03-13 11:23:06 +01:00
parent 42529c4341
commit 27d94b7e03
2 changed files with 20 additions and 74 deletions
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88
sql/item_cmpfunc.cc
View file

@ -745,46 +745,6 @@ static Item** cache_converted_constant(THD *thd, Item **value,
}
/**
Retrieves correct DATETIME value from given item.
@param[in] thd thread handle
@param[in,out] item_arg item to retrieve DATETIME value from
@param[in,out] cache_arg pointer to place to store the caching item to
@param[in] warn_item item for issuing the conversion warning
@param[out] is_null TRUE <=> the item_arg is null
@details
Retrieves the correct DATETIME value from given item for comparison by the
compare_datetime() function.
If the value should be compared as time (TIME_RESULT), it's retrieved as
MYSQL_TIME. Otherwise it's read as a number/string and converted to time.
Constant items are cached, so the convertion is only done once for them.
Note the f_type behavior: if the item can be compared as time, then
f_type is this item's field_type(). Otherwise it's field_type() of
warn_item (which is the other operand of the comparison operator).
This logic provides correct string/number to date/time conversion
depending on the other operand (when comparing a string with a date, it's
parsed as a date, when comparing a string with a time it's parsed as a time)
If the item is a constant it is replaced by the Item_cache_int, that
holds the packed datetime value.
@return
MYSQL_TIME value, packed in a longlong, suitable for comparison.
*/
longlong get_datetime_value(Item *item, enum_field_types f_type, bool *is_null)
{
longlong value= item->val_temporal_packed(f_type);
if ((*is_null= item->null_value))
return ~(ulonglong) 0;
return value;
}
/*
Compare items values as dates.
@ -793,8 +753,7 @@ longlong get_datetime_value(Item *item, enum_field_types f_type, bool *is_null)
DESCRIPTION
Compare items values as DATE/DATETIME for both EQUAL_FUNC and from other
comparison functions. The correct DATETIME values are obtained
with help of the get_datetime_value() function.
comparison functions.
RETURN
-1 a < b or at least one item is null
@ -804,20 +763,19 @@ longlong get_datetime_value(Item *item, enum_field_types f_type, bool *is_null)
int Arg_comparator::compare_temporal(enum_field_types type)
{
bool a_is_null, b_is_null;
longlong a_value, b_value;
if (set_null)
owner->null_value= 1;
/* Get DATE/DATETIME/TIME value of the 'a' item. */
a_value= get_datetime_value(*a, type, &a_is_null);
if (a_is_null)
a_value= (*a)->val_temporal_packed(type);
if ((*a)->null_value)
return -1;
/* Get DATE/DATETIME/TIME value of the 'b' item. */
b_value= get_datetime_value(*b, type, &b_is_null);
if (b_is_null)
b_value= (*b)->val_temporal_packed(type);
if ((*b)->null_value)
return -1;
/* Here we have two not-NULL values. */
@ -830,16 +788,15 @@ int Arg_comparator::compare_temporal(enum_field_types type)
int Arg_comparator::compare_e_temporal(enum_field_types type)
{
bool a_is_null, b_is_null;
longlong a_value, b_value;
/* Get DATE/DATETIME/TIME value of the 'a' item. */
a_value= get_datetime_value(*a, type, &a_is_null);
a_value= (*a)->val_temporal_packed(type);
/* Get DATE/DATETIME/TIME value of the 'b' item. */
b_value= get_datetime_value(*b, type, &b_is_null);
return a_is_null || b_is_null ? a_is_null == b_is_null
: a_value == b_value;
b_value= (*b)->val_temporal_packed(type);
return (*a)->null_value || (*b)->null_value ?
(*a)->null_value == (*b)->null_value : a_value == b_value;
}
int Arg_comparator::compare_string()
@ -2163,9 +2120,7 @@ void Item_func_between::fix_length_and_dec()
/*
When comparing as date/time, we need to convert non-temporal values
(e.g. strings) to MYSQL_TIME. get_datetime_value() does it
automatically when one of the operands is a date/time. But here we
may need to compare two strings as dates (str1 BETWEEN str2 AND date).
(e.g. strings) to MYSQL_TIME.
For this to work, we need to know what date/time type we compare
strings as.
*/
@ -2197,23 +2152,22 @@ longlong Item_func_between::val_int()
case TIME_RESULT:
{
longlong value, a, b;
bool value_is_null, a_is_null, b_is_null;
enum_field_types f_type= field_type_for_temporal_comparison(compare_as_dates);
value= get_datetime_value(args[0], f_type, &value_is_null);
value= args[0]->val_temporal_packed(f_type);
if ((null_value= value_is_null))
if ((null_value= args[0]->null_value))
return 0;
a= get_datetime_value(args[1], f_type, &a_is_null);
b= get_datetime_value(args[2], f_type, &b_is_null);
a= args[1]->val_temporal_packed(f_type);
b= args[2]->val_temporal_packed(f_type);
if (!a_is_null && !b_is_null)
if (!args[1]->null_value && !args[2]->null_value)
return (longlong) ((value >= a && value <= b) != negated);
if (a_is_null && b_is_null)
if (args[1]->null_value && args[2]->null_value)
null_value=1;
else if (a_is_null)
null_value= value <= b; // not null if false range.
else if (args[1]->null_value)
null_value= value <= b; // not null if false range.
else
null_value= value >= a;
break;
@ -3777,9 +3731,8 @@ void in_datetime::set(uint pos,Item *item)
uchar *in_datetime::get_value(Item *item)
{
bool is_null;
enum_field_types f_type= item->field_type_for_temporal_comparison(warn_item);
tmp.val= get_datetime_value(item, f_type, &is_null);
tmp.val= item->val_temporal_packed(f_type);
if (item->null_value)
return 0;
tmp.unsigned_flag= 1L;
@ -4040,9 +3993,8 @@ cmp_item* cmp_item_decimal::make_same()
void cmp_item_datetime::store_value(Item *item)
{
bool is_null;
enum_field_types f_type= item->field_type_for_temporal_comparison(warn_item);
value= get_datetime_value(item, f_type, &is_null);
value= item->val_temporal_packed(f_type);
m_null_value= item->null_value;
}

6
sql/item_cmpfunc.h
View file

@ -1266,7 +1266,6 @@ public:
/*
Class to represent a vector of constant DATE/DATETIME values.
Values are obtained with help of the get_datetime_value() function.
*/
class in_datetime :public in_longlong
{
@ -1436,7 +1435,6 @@ public:
/*
Compare items in the DATETIME context.
Values are obtained with help of the get_datetime_value() function.
*/
class cmp_item_datetime : public cmp_item_scalar
{
@ -2614,10 +2612,6 @@ inline bool is_cond_or(Item *item)
Item *and_expressions(Item *a, Item *b, Item **org_item);
longlong get_datetime_value(Item ***item_arg, Item **cache_arg,
enum_field_types f_type, bool *is_null);
class Comp_creator
{
public: