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https://issues.apache.org/jira/browse/CALCITE-2597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16632193#comment-16632193
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Julian Hyde commented on CALCITE-2597:
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It's up to the derived class to include everything relevant in the digest. For
example, {{RelRecordType}} includes the fields (its constructor calls
{{computeDigest()}} which calls {{computeTypeString(true)}}, which calls
{{field.getType().getFullTypeString()}} for each field).
In your case, your fields have a type that is a non-standard class, so make
sure that its {{getFullTypeString()}} is doing what you need it to.
> RelDataTypeImpl：digest can not describe a type completely.
> ----------------------------------------------------------
>
> Key: CALCITE-2597
> URL: https://issues.apache.org/jira/browse/CALCITE-2597
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: huangjiatian
> Assignee: Julian Hyde
> Priority: Minor
> Attachments: image-2018-09-28-13-00-16-440.png,
> image-2018-09-28-13-11-43-515.png, image-2018-09-28-13-15-19-711.png,
> image-2018-09-28-13-17-19-369.png
>
>
> I met a strange question when i use Flink SQL API.
> I found two difference type are considered equal.
> !image-2018-09-28-13-11-43-515.png!
> After debug, i found the hashCode method and equals method in RelRecordType
> just consider "digest".
> !image-2018-09-28-13-15-19-711.png!
> But some time, "digest" can not describe a type completely, More information
> in the "fieldList".
> !image-2018-09-28-13-17-19-369.png!
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