Hello Jerome, On 01/26/2017 11:35 PM, jerome brauge wrote:

Hi, I'm testing datatype compatibility provide by MDEV-10343 and I have some comments: 1) Oracle character datatype (char, varchar, varchar2) doesn't accept a length of 0 char Example : select cast('tt' as char(0)) from dual; ORA-01723: zero-length columns are not allowed MariaDB return an empty string (to relate with MDEV-10574) This point is a study case, no matter.

2) NUMBER Type You have choosing TYPE_DOUBLE if scale/prec is not specified and I think that it's a mistake for 2 reasons: - Oracle NUMBER() is near an "exact" datatype and cannot be replace by a standard double. - Convert number to char never use scientific notation

The use of a decimal(64,24) makes it possible to obtain results very close to those of oracle. I attach two files to show this.

In fact FLOAT and INTEGER are subtype of NUMBER for Oracle. MariaDB float and double seems to be like BINARY_FLOAT and BINARY_DOUBLE.

See https://docs.oracle.com/cd/B28359_01/server.111/b28285/sqlqr06.htm#CHDBBHHE for more details.

Thanks for a good proposal. I have created a task for this: https://jira.mariadb.org/browse/MDEV-11921

Best regard, Jérôme.