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https://issues.apache.org/jira/browse/DAFFODIL-1985?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Beckerle reassigned DAFFODIL-1985:
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Assignee: Michael Beckerle
> beforeState in sequences prevents streaming behavior in I/O layer
> ------------------------------------------------------------------
>
> Key: DAFFODIL-1985
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1985
> Project: Daffodil
> Issue Type: Bug
> Components: Back End
> Affects Versions: 2.2.0
> Reporter: Michael Beckerle
> Assignee: Michael Beckerle
> Priority: Major
> Fix For: 2.2.0
>
>
> The refactoring/rewrite of sequences used two saved states for arrays with
> Points of uncertainty, a beforeState at the very start of the array, and a
> priorState which the state prior to the current attempt to parse an
> occurrance.
> In a code review it was observed that this beforeState prevents streaming by
> holding onto the I/O layer mark state for the entire array.
> Arguably, the beforeState is not only unnecessary, but incorrect. Arrays
> don't need a PoU before the entire array that doesn't advance when
> occurrences are found. If the array is determined to exist, because at least
> one occurrence exists, then failure of the entire array causes the enclosing
> PoU to be determined, not an artificial one created at the start of the
> array.
> Remove beforeState to fix.
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