[
https://issues.apache.org/jira/browse/CALCITE-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16593042#comment-16593042
]
Julian Hyde commented on CALCITE-2470:
--------------------------------------
bq. new RelBuilder#project seems to ignore given Iterable<String> fieldNames.
Is that intended? Is that a bug?
The {{fieldNames}} argument is used
[here|https://github.com/julianhyde/calcite/blob/d6ec5ff765207d9951b9f2e579f208ecc94583ee/core/src/main/java/org/apache/calcite/tools/RelBuilder.java#L1023].
Or did you have a different {{project}} method in mind?
> RelBuilder.project should combine expressions if underlying node is a Project
> -----------------------------------------------------------------------------
>
> Key: CALCITE-2470
> URL: https://issues.apache.org/jira/browse/CALCITE-2470
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.18.0
>
>
> The {{RelBuilder.project}} method should combine expressions if underlying
> node is a {{Project}}.
> For example, if {{r}} is a {{RelBuilder}} and its stack initially contains
> {code:java}
> Project(Scan(T), a, b, a + b as c){code}
> and we call (in pseudo-code)
> {code:java}
> r.project(a + c as d){code}
> then the result should be
> {code:java}
> Project(Scan(T), a + (a + b) as d){code}
> Today the result is
> {code:java}
> Project(Project(Scan(T), a, a + b as c), a + c as d){code}
> In some circumstances the result will be larger (i.e. contain more
> {{RexNode}} instances) but much more frequently the result will be smaller
> and simpler.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
