I've just added a test case to jexl in the sandbox that double array lookups
are not quite working properly. Double array lookups can be useful when
using the SQL tags from JSTL.
e.g. in Jelly I hit this problem when trying to output the first field of
the first row using...
<sql:query var="results">
select * from foo
</sql:query>
<j:expr value="${results.rowsByIndex[0][0]}"/>
James
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