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https://issues.apache.org/jira/browse/MRQL-43?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leonidas Fegaras updated MRQL-43:
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Attachment: MRQL-43.patch
> Add support for tracing
> -----------------------
>
> Key: MRQL-43
> URL: https://issues.apache.org/jira/browse/MRQL-43
> Project: MRQL
> Issue Type: Improvement
> Affects Versions: 0.9.4
> Reporter: Leonidas Fegaras
> Assignee: Leonidas Fegaras
> Priority: Minor
> Attachments: MRQL-43.patch
>
>
> The following patch adds support for run-time tracing of sub-expressions in a
> query. This is done with the function trace. This is useful for debugging
> queries. For example:
> {code}
> select trace( (x.A,x.B) ) from x in X
> {code}
> will print the value of the tuple (x.A,x.B) for every x in X.
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