[jira] [Commented] (CALCITE-4332) Improve error when planning rule produces a relation with a wrong rowtype

["Chunwei Lei (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-4332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17212228#comment-17212228 ] 

Chunwei Lei commented on CALCITE-4332:
--------------------------------------

That would be great. I met the same confusing error message couple of times. It is hard to figure out which field went wrong in the current message.

> Improve error when planning rule produces a relation with a wrong rowtype
> -------------------------------------------------------------------------
>
>                 Key: CALCITE-4332
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4332
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.26.0
>            Reporter: Vladimir Sitnikov
>            Priority: Major
>
> Current coed in {{VolcanoPlanner}}:
> {code:java}
>       assert RelOptUtil.equal(
>           "rel rowtype",
>           rel.getRowType(),
>           "equivRel rowtype",
>           equivRel.getRowType(),
>           Litmus.THROW);
>       equivRel = ensureRegistered(equivRel, null);
> {code}
> The suggested changes:
> 1) Use regular error {{IllegalArgumentException}} rather than an assertion
> 2) Make sure the exception message contains fine-grained information on what went wrong. For instance: {{name: non nullable -> nullable; description: character -> int; ...}}



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