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https://issues.apache.org/jira/browse/DRILL-5021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers reassigned DRILL-5021:
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Assignee: (was: Paul Rogers)
> ExternalSortBatch redundantly redefines the batch schema
> --------------------------------------------------------
>
> Key: DRILL-5021
> URL: https://issues.apache.org/jira/browse/DRILL-5021
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.8.0
> Reporter: Paul Rogers
> Priority: Minor
>
> Much code in the {{ExternalSortBatch}} (ESB) deals with building vector
> batches and schemas. However, ESB cannot handle schema changes. The only
> valid schema difference is the same field path in a different position in the
> vector array. Given this restriction, the code can be simplified (and sped
> up) by exploiting the fact that all batches are required to have the same
> conceptual schema (same set of fields, but perhaps in different vector order)
> and most probably, the same physical schema (same fields and same vector
> order.) Note that, because of the way that the {{getValueVectorId()}} method
> works, each lookup of a value vector is an O\(n) operation, so that each
> remapping of vectors is O(n\^2).
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