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MDEV-9334 ALTER from DECIMAL to BIGINT UNSIGNED returns a wrong result

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When altering from DECIMAL to *INT UNIGNED or to BIT, go through val_decimal(),
to avoid truncation to the biggest possible signed integer
(0x7FFFFFFFFFFFFFFF / 9223372036854775807).
This commit is contained in:
Alexander Barkov
2018-06-15 10:11:51 +04:00
parent ec4fdd5749
commit c55de8d40b
5 changed files with 73 additions and 0 deletions
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4
sql/field.h
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@ -1636,6 +1636,8 @@ public:
bool eq_def(const Field *field) const;
Copy_func *get_copy_func(const Field *from) const
{
if (unsigned_flag && from->cmp_type() == DECIMAL_RESULT)
return do_field_decimal;
return do_field_int;
}
int save_in_field(Field *to)
@ -3661,6 +3663,8 @@ public:
}
Copy_func *get_copy_func(const Field *from) const
{
if (from->cmp_type() == DECIMAL_RESULT)
return do_field_decimal;
return do_field_int;
}
int save_in_field(Field *to) { return to->store(val_int(), true); }