On 2018-May-17, Tom Lane wrote: > "David G. Johnston" <david.g.johns...@gmail.com> writes: > > On Thu, May 17, 2018 at 8:46 AM, Tom Lane <t...@sss.pgh.pa.us> wrote: > >> Maybe "Can the scan direction be reversed in mid-scan?". I'm not > >> absolutely sure that that's better ... > > > A cursory read might conclude that "reversing" can only happen once while > > they will likely understand that "changing" can happen multiple times. > > This is minor point - the two are effectively the same. > > Maybe: "Supports both FETCH FORWARD and FETCH BACKWARD during the same scan" > > Oh, yeah, mentioning what it's *for* would help clarify things, no? > So perhaps > > "Can the scan direction be changed in mid-scan (to support FETCH FORWARD > and FETCH BACKWARD on a cursor)?"
To me that sounds like the flag is a prerequisite of using the cursor in either direction. But maybe "to support both FETCH FORWARD and FETCH BACKWARD on the same cursor" is sufficient. Or maybe "to support changing scan direction on a cursor". To make matters worse, IIUC it's actually fine to read the cursor in one direction to completion, then in the other direction to completion, without this flag, right? -- Álvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
