Re: BUG #14016: Incomplete documentation of IN subquery expression

On Fri, Mar 11, 2016 at 9:39 AM, <manlio(dot)perillo(at)gmail(dot)com> wrote:

> The following bug has been logged on the website:
>
> Bug reference: 14016
> Logged by: Manlio Perillo
> Email address: manlio(dot)perillo(at)gmail(dot)com
> PostgreSQL version: 9.5.1
> Operating system: Linux
> Description:
>
> At the end of the documentation for VALUE (sql-values.html), there is the
> following tip:
> "For simple IN tests, it's better to rely on the list-of-scalars form of IN
> than to write a VALUES query as shown above"
>
> However there is no reference to the "list-of-scalars" forms of IN, in the
> functions-subquery.html page. It is only reported that the supported
> syntax
> is "expression IN (subquery)"
>
> The reference was available in an old version (7.3), where the manual
> documented both the scalar form and sub query form:
> "expression IN (value[, ...])"
>

​It was moved...

​
http://www.postgresql.org/docs/9.5/interactive/functions-comparisons.html#AEN20283

​The interpretation being that a "list of scalars" is, in this situation,
semantically equivalent to an array - though having the later you would
have to use "=ANY(array)" instead of "IN"

​Apparently someone disagreed with the note in the subquery section:

>>>Note: This form of IN is not truly a subquery expression, but it seems
best to document it in the same place as subquery IN.

David J.