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https://issues.apache.org/jira/browse/CALCITE-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855663#comment-16855663
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pengzhiwei commented on CALCITE-1581:
-------------------------------------
Hi [~julianhyde],Thanks for you constructive suggestion. I have fixed most
problem you mentioned and also added some test case. But there is one I am not
very understand.
* _The "handle..." method works in a mysterious way. Perhaps it writes into an
IdentityHashMap, perhaps not._
The "selectTableFunctions" is used to associate the SqlSelect with the Table
Function contains in the select list. In the "handleTableFunctionInSelect"
method,I will always put it to the _IdentityHashMap_ except that there exist a
validate exception .
Please have a review again when you have time,Thanks!
.
> UDTF like in hive
> -----------------
>
> Key: CALCITE-1581
> URL: https://issues.apache.org/jira/browse/CALCITE-1581
> Project: Calcite
> Issue Type: New Feature
> Reporter: Xiaoyong Deng
> Assignee: pengzhiwei
> Priority: Major
> Labels: pull-request-available, udtf
> Fix For: 1.20.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Support one row in and multi-column/multi-row out(one-to-many mapping), just
> like udtf in hive.
> The query would like this:
> {code}
> select
> func(c0, c1) as (f0, f1, f2)
> from table_name;
> {code}
> c0 and c1 are 'table_name' columns. f0, f1 and f2 are new generated columns.
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