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https://issues.apache.org/jira/browse/MRQL-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15540751#comment-15540751
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ASF GitHub Bot commented on MRQL-97:
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Github user asfgit closed the pull request at:
https://github.com/apache/incubator-mrql/pull/27
> Support for source-level debugging
> ----------------------------------
>
> Key: MRQL-97
> URL: https://issues.apache.org/jira/browse/MRQL-97
> Project: MRQL
> Issue Type: Bug
> Components: Evaluation, Query Translation
> Affects Versions: 0.9.8
> Reporter: Leonidas Fegaras
> Assignee: Leonidas Fegaras
> Priority: Minor
>
> This patch extends the debugger of MRQL-96 with source-level debugging.
> Before this patch, debugging was done at the algebraic level, which is not
> user-friendly. With the new debugger, one can explore the query output in
> both the algebraic and the source level. At the algebraic level is as before.
> For the source level, one has to mark the source MRQL query using the trace
> function. Then, the lineage tracer (the lineage command) and the debugger
> (the debug command) can trace the trace terms only. Example:
> {code}
> debug select ( k, trace(avg(a.Y)) )
> from a in source(binary,"tmp/points.bin")
> group by k: trace(a.X);
> {code}
> will trace both a.X and avg(a.Y).
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