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since NUMBER(8) is not enough to store the maximum number of bigint.
Oracle NUMBER(p,0) as handled as integer
because there is no dedicated integer sql data type exist in Oracle database.
Also NUMBER(p,s) precision can take up to 38. p means the number of digits, not the byte length.
bigint type needs 19 digits as follows.
$ irb
2.2.2 :001 > limit = 8
=> 8
2.2.2 :002 > maxvalue_of_bigint = 1 << ( limit * 8 - 1)
=> 9223372036854775808
2.2.2 :003 > puts maxvalue_of_bigint.to_s.length
19
=> nil
2.2.2 :004 >
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Fixes #18787.
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In some cases there is a difference between the two, we should always
be doing one or the other. For convenience, `type_cast` is still a
private method on type, so new types that do not need different behavior
don't need to implement two methods, but it has been moved to private so
it cannot be used accidentally.
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The `:timestamp` type for columns is unused. All database adapters treat
them as the same database type. All code in `ActiveRecord` which changes
its behavior based on the column's type acts the same in both cases.
However, when the type is passed to code that checks for the `:datetime`
type, but not `:timestamp` (such as XML serialization), the result is
unexpected behavior.
Existing schema definitions will continue to work, and the `timestamp`
type is transparently aliased to `datetime`.
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The decision to wrap type registrations in a proc was made for two
reasons.
1. Some cases need to make an additional decision based on the type
(e.g. a `Decimal` with a 0 scale)
2. Aliased types are automatically updated if they type they point to is
updated later. If a user or another adapter decides to change the
object used for `decimal` columns, `numeric`, and `number` will
automatically point to the new type, without having to track what
types are aliased explicitly.
Everything else here should be pretty straightforward. PostgreSQL ranges
had to change slightly, since the `simplified_type` method is gone.
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