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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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)