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https://issues.apache.org/jira/browse/METAMODEL-200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14970896#comment-14970896
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ASF GitHub Bot commented on METAMODEL-200:
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Github user LosD commented on the pull request:
https://github.com/apache/metamodel/pull/62#issuecomment-150558274
Code looks good, but it's not a particular good change to me: It is totally
fine to add new functions (like approximate_count() or something like that)
that are not base SQL, but breaking SQL syntax seems a bit... Nasty to me.
Relational database vendors do all kinds of horrible things to SQL, but I
don't think even they would go that far.
> No syntax available in SQL representation of Query for "function
> approximation"
> -------------------------------------------------------------------------------
>
> Key: METAMODEL-200
> URL: https://issues.apache.org/jira/browse/METAMODEL-200
> Project: Apache MetaModel
> Issue Type: Bug
> Reporter: Kasper Sørensen
>
> In MetaModel we have a flag that can be set on e.g. "COUNT( * )" which
> indicates if the database may approximate the number instead of doing a
> consistent calculation. This is good for optimization scenarios where you
> don't need an actual count, just an estimate (for progress bars and similar
> stuff in UIs).
> But unfortunately we don't have any syntax support for this when dealing with
> String queries. Shouldn't we add that?
> I could imagine a prefix or something like that, e.g. the "tilde / ~" symbol,
> like this:
> {code}
> SELECT ~COUNT(*) FROM table
> {code}
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