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Posted to issues@calcite.apache.org by "Rui Wang (Jira)" <ji...@apache.org> on 2020/01/15 05:21:00 UTC
[jira] [Resolved] (CALCITE-3629) Table-valued function implementor
interface
[ https://issues.apache.org/jira/browse/CALCITE-3629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Rui Wang resolved CALCITE-3629.
-------------------------------
Fix Version/s: 1.22.0
Resolution: Fixed
> Table-valued function implementor interface
> -------------------------------------------
>
> Key: CALCITE-3629
> URL: https://issues.apache.org/jira/browse/CALCITE-3629
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
> Fix For: 1.22.0
>
>
> The current implementation of TUMBLE is the following:
> {code:java}
> if (isTumble()) {
> // create expressions and blockstatement
> } else {
> // other table function scan enumerable implementation.
> }
> {code}
> This style is less extensible. We will add more builtin table-valued function implementation and we shouldn't add more if-else with complicated implementation.
> A better practice is in RexImpTable, each operator register its implementor, and then the code will be becomes:
> {code:java}
> if (implementor defined) {
> return implementor.implement(...)
> } else {
> // default table function scan enumerable implementation for those that does not have implementor.
> }
> {code}
> The current implementor[1] or [2] is not enough for table-valued function as table-valued function need both inputPhysType and outPhysType, and potential other params to implement itself.
> Another condition is we might need more table-valued function implementations to abstract a common interface.
> [1]: https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/adapter/enumerable/CallImplementor.java#L38
> [2]: https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/adapter/enumerable/NotNullImplementor.java
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