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https://issues.apache.org/jira/browse/CALCITE-5488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Will Noble reassigned CALCITE-5488:
-----------------------------------
Assignee: Will Noble
> Calcite double-adjusts timestamps when calling Array.getResultSet()
> -------------------------------------------------------------------
>
> Key: CALCITE-5488
> URL: https://issues.apache.org/jira/browse/CALCITE-5488
> Project: Calcite
> Issue Type: Bug
> Reporter: Will Noble
> Assignee: Will Noble
> Priority: Minor
>
> If you go into {{AvaticaResultSetConversionTest}} and delete the
> [timeZone|https://github.com/apache/calcite-avatica/blob/dbe9b1d8c2e53474eb40cfaf5721aceca3bdb57f/core/src/test/java/org/apache/calcite/avatica/AvaticaResultSetConversionsTest.java#L1121]
> property for the connection, which is currently set to "GMT", several
> {{getString()}} and {{getArray()}} tests start to fail. The {{getString()}}
> failures are self-explanatory -- the expected value has become incorrect
> because of the time zone change -- but the {{getArray()}} failures are
> tricky. They're double-adjusting the timestamps:
> * Once when they call
> [getObject()|https://github.com/apache/calcite-avatica/blob/810acf80771310431d7ef576f3404299ebb8eaf2/core/src/main/java/org/apache/calcite/avatica/util/AbstractCursor.java#L1432]
> (which invokes {{getTimestamp()}} with the connection's default calendar,
> which was previously GMT but is now the system default).
> * Then, in
> [ArrayImpl.equalContents()|https://github.com/apache/calcite-avatica/blob/820edf6f653607afb5a2a280a32f315aff1f64cb/core/src/main/java/org/apache/calcite/avatica/util/ArrayImpl.java#L233]
> the arrays are converted to result sets for traversal via
> [Array.getResultSet()|https://docs.oracle.com/javase/8/docs/api/java/sql/Array.html#getResultSet--]
> , which uses the same time zone as the "factory" result set and eventually
> invokes {{getObject()}} again, thus applying the time zone offset twice.
> This is a bug in the implementation of {{Array.getResultSet()}} that only
> manifests when the array contains timestamps and when the connection default
> time zone is anything besides GMT, and this is not currently covered by
> tests. It's easy to cause the failure, however, by changing the connection
> default time zone for {{AvaticaResultSetConversionTest}} to anything besides
> GMT or UTC.
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