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https://issues.apache.org/jira/browse/HIVE-18279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16296629#comment-16296629
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Zoltan Haindrich commented on HIVE-18279:
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afaik stats collection should be able to work with other serdes as well...I
suspect that they are adding data to the table by using filesystem
operations..that can cause troubles like this.
I think they might probably want to disable {{hive.stats.autogather}}
> Incorrect condition in StatsOpimizer
> ------------------------------------
>
> Key: HIVE-18279
> URL: https://issues.apache.org/jira/browse/HIVE-18279
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Reporter: Oleksiy Sayankin
> Assignee: Oleksiy Sayankin
> Fix For: 3.0.0
>
> Attachments: HIVE-18279.1.patch
>
>
> At the moment {{StatsOpimizer}} has code
> {code}
> if (rowCnt == null) {
> // if rowCnt < 1 than its either empty table or table on which
> stats are not
> // computed We assume the worse and don't attempt to optimize.
> Logger.debug("Table doesn't have up to date stats " +
> tbl.getTableName());
> rowCnt = null;
> }
> {code}
> in method {{private Long getRowCnt()}}. Condition
> {code}
> if (rowCnt == null) {
> {code}
> should be changed to
> {code}
> if (rowCnt == null || rowCnt == 0) {
> {code}
> because 0 value also means that table stats may not be computed.
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