Leonidas Fegaras created MRQL-43:
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Summary: 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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