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https://issues.apache.org/jira/browse/CALCITE-497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14257311#comment-14257311
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Vladimir Sitnikov commented on CALCITE-497:
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{quote}we should model column-groups as records{quote}
I think it makes sense to consider the following:
1) List of 'columns' in group might depend on the actual row.
2) It might require non-trivial IO get the list of columns (see #1).
BTW: it would be nice if jdbcschema could perform lazy-loading of required
table/column names.
> Support optional qualifier for column name references
> -----------------------------------------------------
>
> Key: CALCITE-497
> URL: https://issues.apache.org/jira/browse/CALCITE-497
> Project: Calcite
> Issue Type: Sub-task
> Reporter: James Taylor
> Assignee: Julian Hyde
> Labels: phoenix
>
> Some systems, such as HBase, have a named group to which columns belong (i.e.
> a column family in this case). To disambiguate column references (i.e. if the
> same column name is used in different column families), it's useful to allow
> an optional qualifier. This is similar to the RECORD field mechanism that
> Calcite already supports, but in this case the record name would be optional,
> since it's not necessary if the column names are unique. For example:
> http://phoenix.apache.org/language/index.html#column_ref
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