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MDEV-17776 CAST(x AS INTERVAL DAY_SECOND(N))

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This commit is contained in:
Alexander Barkov
2018-11-20 13:47:52 +04:00
parent dde2ca4aa1
commit 21a5884081
11 changed files with 353 additions and 86 deletions
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34
sql/sql_type.h
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@ -954,6 +954,16 @@ public:
{
return TIME_MAX_INTERVAL_HOUR;
}
static uint max_int_part_char_length()
{
// e.g. '+3652058 23:59:59'
return 1/*sign*/ + TIME_MAX_INTERVAL_DAY_CHAR_LENGTH + 1 + 8/*hh:mm:ss*/;
}
static uint max_char_length(uint fsp)
{
DBUG_ASSERT(fsp <= TIME_SECOND_PART_DIGITS);
return max_int_part_char_length() + (fsp ? 1 : 0) + fsp;
}
public:
Interval_DDhhmmssff(THD *thd, Status *st, bool push_warnings,
Item *item, ulong max_hour);
@ -975,6 +985,17 @@ public:
{
return time_type == MYSQL_TIMESTAMP_NONE || is_valid_interval_DDhhmmssff();
}
String *to_string(String *str, uint dec) const
{
if (!is_valid_interval_DDhhmmssff())
return NULL;
str->set_charset(&my_charset_numeric);
if (!str->alloc(MAX_DATE_STRING_REP_LENGTH))
str->length(my_interval_DDhhmmssff_to_str(this,
const_cast<char*>(str->ptr()),
dec));
return str;
}
};
@ -5311,6 +5332,16 @@ public:
};
// A pseudo type handler, mostly for test purposes for now
class Type_handler_interval_DDhhmmssff: public Type_handler_long_blob
{
public:
Item *create_typecast_item(THD *thd, Item *item,
const Type_cast_attributes &attr) const;
};
/**
A handler for hybrid type functions, e.g.
COALESCE(), IF(), IFNULL(), NULLIF(), CASE,
@ -5443,6 +5474,9 @@ extern MYSQL_PLUGIN_IMPORT Type_handler_blob type_handler_blob;
extern MYSQL_PLUGIN_IMPORT Type_handler_medium_blob type_handler_medium_blob;
extern MYSQL_PLUGIN_IMPORT Type_handler_long_blob type_handler_long_blob;
extern MYSQL_PLUGIN_IMPORT Type_handler_interval_DDhhmmssff
type_handler_interval_DDhhmmssff;
class Type_aggregator
{
bool m_is_commutative;