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https://issues.apache.org/jira/browse/HIVE-24353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17226263#comment-17226263
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David Mollitor commented on HIVE-24353:
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Take a look at [HIVE-21241]
> performance: Refactor TimestampTZ parsing
> -----------------------------------------
>
> Key: HIVE-24353
> URL: https://issues.apache.org/jira/browse/HIVE-24353
> Project: Hive
> Issue Type: Improvement
> Reporter: Vincenz Priesnitz
> Priority: Minor
>
> I found that for datasets that contain a lot of timestamps (without
> timezones) hive spends the majority of time in TimestampTZUtil.parse, in
> particular constructing stractraces for the try-catch blocks.
> When parsing TimestampTZ we are currently using a fallback chain with several
> try-catch blocks. For a common timestamp string without a timezone, we
> currently throw and catch 2 exceptions, and actually parse the string twice.
> I propose a refactor, that parses the string once and then expresses the
> fallback chain with queries to the parsed TemporalAccessor.
>
>
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