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Posted to issues@calcite.apache.org by "Danny Chen (Jira)" <ji...@apache.org> on 2021/12/05 04:00:00 UTC
[jira] [Commented] (CALCITE-4865) Extends Table function to support Polymorphic Table Function
[ https://issues.apache.org/jira/browse/CALCITE-4865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17453514#comment-17453514 ]
Danny Chen commented on CALCITE-4865:
-------------------------------------
Hi, [~julianhyde], what do you think about the parser part ? The PR separate the table function parse block out now.
> Extends Table function to support Polymorphic Table Function
> ------------------------------------------------------------
>
> Key: CALCITE-4865
> URL: https://issues.apache.org/jira/browse/CALCITE-4865
> Project: Calcite
> Issue Type: Sub-task
> Components: core
> Reporter: Jing Zhang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> This Jira aims to extend existed Table function in order to support
> Polymorphic Table Function, including:
> * Introduces generic input table parameter which has 3 characteristics:
> ## Input tables have either row semantics or set semantics)
> ### Row semantics means that the the result of the PTF is decided on a row-by-row basis.
> ### Set semantics means that the outcome of the function depends on how the data is partitioned.
> ## The second characteristic, which applies only to input tables with set semantics, is whether the PTF can generate a result row even if the input table is empty.
> ## The third characteristic is whether the input table supports pass-through columns or not. Pass-through columns is a mechanism enabling the PTF to copy every column of an input row into columns of an output row.
> * Introduces generic input table parameter which has 3 characteristics:
> * Extends `SqlFunction` to support generic input table parameter
> * Adds validator for table function
> ## only input table parameter with set semantics could be partitioned or ordered
> ## At most has one input table parameter with row semantics
> * Updates `Parser.jj` to allow partition by clause and order by clause follow after input table parameter of table function
> * Adds test
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