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https://issues.apache.org/jira/browse/KYLIN-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15562527#comment-15562527
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Dong Li edited comment on KYLIN-2068 at 10/10/16 3:07 PM:
----------------------------------------------------------
Hi Yiming,
I saw a new field(comment) in ColumnDesc. This may cause compatible issue on
metadata from old versions.
The old metadata (in json) may not be deserialized due to field missing, and
user has to upgrade metadata for this field.
Maybe you can add following annotation to the field, to mark the field as
optional.
@JsonInclude(JsonInclude.Include.NON_NULL)
You can find a reference in class org.apache.kylin.cube.model.RowKeyColDesc
Thanks,
Dong
was (Author: lidong_sjtu):
Hi Yiming,
I saw a new field(comment) in ColumnDesc. This may cause compatible issue on
metadata from old versions.
The old metadata (in json) may not be deserialized due to field missing, and
user must do metadata upgrade for this field.
Maybe you can add following annotation to the field, to mark the field as
optional.
@JsonInclude(JsonInclude.Include.NON_NULL)
You can find a reference in class org.apache.kylin.cube.model.RowKeyColDesc
Thanks,
Dong
> Import hive comment when sync tables
> ------------------------------------
>
> Key: KYLIN-2068
> URL: https://issues.apache.org/jira/browse/KYLIN-2068
> Project: Kylin
> Issue Type: Improvement
> Components: Metadata
> Reporter: Billy(Yiming) Liu
> Assignee: Billy(Yiming) Liu
> Priority: Minor
> Labels: newbie
> Attachments: KYLIN-2068.patch
>
>
> Current Sync Table imports the table names, column names and data type,
> without comment. The "comment" is useful for understanding the column and
> cube designing. May I propose to include the comment information into column
> metadata.
> Both backend and GUI work needed.
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