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https://issues.apache.org/jira/browse/CALCITE-7475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18079582#comment-18079582
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Mihai Budiu commented on CALCITE-7475:
--------------------------------------
I think the main question is whether is stays in the Babel parser or it is
moved in the main Parser.jj.
In our compiler we actually use this operator by using the parser extensibility
mechanisms (the same way Babel does), so I think that in practice anyone who
wants to build a Calcite-based compiler can actually use this operator without
too much effort.
What is the problem that you want to solve really?
> Babel parser allows postfix access after PostgreSQL-style :: infix cast
> -----------------------------------------------------------------------
>
> Key: CALCITE-7475
> URL: https://issues.apache.org/jira/browse/CALCITE-7475
> Project: Calcite
> Issue Type: Improvement
> Components: babel
> Affects Versions: 1.41.0
> Reporter: Tamas Mate
> Assignee: krooswu
> Priority: Major
> Labels: pull-request-available
>
> In the Babel parser, InfixCast currently continues with regular postfix
> parsing after expr "::" type.
> This means the parser accepts postfix forms around "::" that go beyond a
> plain infix cast.
> Existing tests already cover examples such as:
>
> {code:java}
> select v.field::integer,
> arr[1].field::varchar,
> v.field.field2::integer,
> v.field[2]::integer
> from t
> select v::varchar array[1].field from t
> select (v::varchar array)[1].field from t{code}
>
>
> The current behavior is subtle because parentheses change how the postfix is
> associated. The existing tests expect:
>
>
> {code:java}
> select v::varchar array[1].field from t{code}
> to unparse as
>
>
> {code:java}
> SELECT `V` :: (VARCHAR ARRAY[1].`FIELD`)
> FROM `T`{code}
> while
>
>
> {code:java}
> select (v::varchar array)[1].field from t{code}
> unparses as
>
>
> {code:java}
> SELECT (`V` :: VARCHAR ARRAY[1].`FIELD`)
> FROM `T`{code}
> This ticket is to decide whether postfix access after "::" should be
> supported in Babel at all, and if so, to document and test the intended
> precedence rules more explicitly.
>
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