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https://issues.apache.org/jira/browse/DRILL-1680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14206028#comment-14206028
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Jacques Nadeau commented on DRILL-1680:
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You can tell the difference between the two by looking at the data type of the
operand. If integer, then Array. If char type, NamedSegment. Doesn't this
solve your issue?
> Use a different expession for ArraySegment and NamedSegment accessors
> ---------------------------------------------------------------------
>
> Key: DRILL-1680
> URL: https://issues.apache.org/jira/browse/DRILL-1680
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Reporter: Hanifi Gunes
>
> Drill planner treats ArraySegment accessors the same way with NamedSegment
> accessors. This ambiguity causes planner to loop indefinitely when projection
> pushdown is enabled (see DRILL-1455). We need to distinctly name two
> operators that have been used to access array segments and named segments.
> Array segments should still use ITEM. However named segments should be
> accessed via some other name just like GETCOLUMN/GETFIELD.
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