alamb commented on issue #22266: URL: https://github.com/apache/datafusion/issues/22266#issuecomment-4521600313
> I think the SQL standard is a good place to start. In most situations, that is what Postgres follows, usually unless there is a good reason to deviate. I know people love to bandy around the term "SQL Standard" (and I have a copy of "Information technology — Database languages —SQL — Part 2: Foundation (SQL/Foundation)" !) but it is a pretty bad example of a spec in my opinion and leaves a lot of things "implementations defined" For example here is an excerpt about `extract` 7) If <extract expression> is specified, then Case: a) If <extract field> is a <primary datetime field> that does not specify SECOND or <extract field> is not a <primary datetime field>, then the declared type of the result is an implementation-defined exact numeric type with scale 0 (zero). b) Otherwise, the declared type of the result is an implementation-defined exact numeric type with scale not less than the specified or implied <time fractional seconds precision> or <interval fractional seconds precision>, as appropriate, of the SECOND <primary datetime field> of the <extract source>. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
