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https://issues.apache.org/jira/browse/IGNITE-4333?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Paschenko resolved IGNITE-4333.
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Resolution: Duplicate
Assignee: Alexander Paschenko
Apparently duplicates IGNITE-4340 - SELECTed arrays are component type erased,
and that's why the problem occurred. Fixed via checking given array's component
type in UPDATE/INSERT/MERGE and converting from {{Object[]}} to desired (non
primitive) array type using metadata from {{QueryEntity}}.
> SQL engine does not preserve metadata about array content's type
> ----------------------------------------------------------------
>
> Key: IGNITE-4333
> URL: https://issues.apache.org/jira/browse/IGNITE-4333
> Project: Ignite
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 1.8
> Reporter: Alexander Paschenko
> Assignee: Alexander Paschenko
> Fix For: 2.0
>
>
> This problem arises on SQL *SELECT* from grid table and on results page
> transfer over network.
> First, when data is *SELECT* ed,
> {{org.apache.ignite.internal.processors.query.h2.IgniteH2Indexing.RowDescriptor#wrap}}
> does not look at array's component type and tries to convert any array to
> {{Object[]}} which turns to {{ClassCastException}} when array is of primitive
> type and erases metadata about its contents when its type is not primitive.
> Then, when results page is transferred over network, array is wrapped into
> {{org.apache.ignite.internal.processors.query.h2.twostep.msg.GridH2Array}}
> which does not have any metadata too, so, even if we had returned primitive
> array from native H2's local *SELECT*, information about its primitiveness
> would be lost anyway, and it would be converted to, say, {{java.lang.Byte[]}}
> after all.
> So, currently there's no way to *SELECT* a primitive array field via SQL.
> Probably this could be fixed by changing {{GridH2Array}}, but this would
> break backward compatibility, so it's an open question for now.
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