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https://issues.apache.org/jira/browse/TINKERPOP-1496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15812313#comment-15812313
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Daniel Kuppitz commented on TINKERPOP-1496:
-------------------------------------------
Back to the initial question of this ticket: I no longer think that every
head-{{as()}} should / can be replaced with a {{select()}}. I've had a quick
look though my latest answers on the mailing list and it didn't take long to
find a traversal that uses a head-{{as()}} to label the current element:
{noformat}
g.V().emit(cyclicPath().or().not(both())).
repeat(both()).until(cyclicPath()).
aggregate("p").by(path()).cap("p").unfold().
limit(local, 1).dedup().map(
__.as("v").select("p").unfold().
filter(unfold().where(eq("v"))).unfold().dedup().
order().by(id, incr).fold()
).dedup()
{noformat}
I'm actually using this pattern quite often (mostly in {{map}}, {{filter}} and
{{union}}).
> Should a head-as("x") always be a select("x")?
> ----------------------------------------------
>
> Key: TINKERPOP-1496
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1496
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.2.2
> Reporter: Marko A. Rodriguez
> Labels: breaking
>
> There are two steps that treat a head of {{as("x")}} as {{select("x")}}.
> {code}
> match(as("x").out().as("y"), ...) => match(select("x").out().as("y"), ...)
> where(as("x").has("name")) => where(select("x").has("name"))
> {code}
> I don't like how these steps are "special" in this respect and I think that
> it would be elegant if a head-{{as()}} has a consistent meaning for all inner
> traversals.
> Thus, I'm wondering if we should make it such that EVERY head {{as("x")}}
> gets translated to {{select("x")}}.
> {code}
> addE("knows").to(as("x").out("mother"))
> property("name", as("x").out("mother").values("name"))
> {code}
> I believe this would be backwards compatible in the sense that there really
> isn't a reason why an inner traversal head-{{as()}} would be used to label.
> Dunno -- definitely need [~dkuppitz]/etc. feedback.
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