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https://issues.apache.org/jira/browse/DRILL-2723?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacques Nadeau resolved DRILL-2723.
-----------------------------------
Resolution: Fixed
Fix Version/s: (was: 1.2.0)
Target Version/s: 1.0.0
Fixed in 5de7d6e
> Inaccurate row count estimate for text files results in BroadcastExchange
> -------------------------------------------------------------------------
>
> Key: DRILL-2723
> URL: https://issues.apache.org/jira/browse/DRILL-2723
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Reporter: Steven Phillips
> Assignee: Jacques Nadeau
>
> The current method for estimating row count in text files is to divide the
> size of the file in bytes by 1024. This row count estimate is used by
> optimizer to decide if BroadcastExchange should be used.
> This results in massive memory consumption when using BroadCast exchange on a
> large table.
> We need a better way of estimating row count, or use a different metric when
> deciding to use BroadcastExchange.
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