liyang created KYLIN-1766:
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Summary: CubeTupleConverter.translateResult() is slow due to date
conversion
Key: KYLIN-1766
URL: https://issues.apache.org/jira/browse/KYLIN-1766
Project: Kylin
Issue Type: Improvement
Reporter: liyang
As attached, profiling shows that current filling tuple is slow especially
about dates. The norm form "yyyy-mm-dd" is parsed into a Date, then converted
into # since epic day. This is slow because of Java's slow SimpleDateFormat.
An idea is to refine the norm form of date/time to be the time millis. This
will save a lot of str <--> date conversions. However the change impacts
dictionary, lookup snapshot, and maybe data ingestion. Also need to think about
backward compatibility.
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