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https://issues.apache.org/jira/browse/ORC-218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113088#comment-16113088
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Martin Grund commented on ORC-218:
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Setting the local timezone does not help since the ORC library uses the TZ
information not only to lookup the local timezone but as well the TZ specified
in the ORC file. In addition, the environment this patch is optimized for does
not accept any system calls outside a list of specifically curated ones.
> [C++] Cache timezone information in the library.
> ------------------------------------------------
>
> Key: ORC-218
> URL: https://issues.apache.org/jira/browse/ORC-218
> Project: ORC
> Issue Type: Improvement
> Reporter: Martin Grund
>
> Right now, for every lookup of a timezone, the library will go to disk and
> parse the timezone file. While the results are cached, doing these system
> calls should be avoided in environments with restricted system calls.
> I prepared a patch that will at build time load all the time zone files into
> the binary and instead of accessing disk for the TZ information will simply
> load the buffer from memory. In addition this allows the user to compile the
> library with a static timezone to be assumed for local use. This comes in
> handy to avoid yet another set of system calls to assume the local timezone.
> The feature can be controlled using the following CMake flags
> * NO_EMBEDED_TZ_DB - to turn it off, by default is on
> * STATIC_TZ=VAL - where val is a name of a timezone.
> I'll create a PR for code-review.
> Would be great if you could consider this patch.
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