Alexander Paschenko created IGNITE-4333:
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Summary: 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
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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