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https://issues.apache.org/jira/browse/HIVE-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12934682#action_12934682
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Namit Jain commented on HIVE-1648:
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In SemanticAnalyzer:addStatsTask:
} else {
6177 List<Node> children = (List<Node>) op.getChildren();
6178 if (children != null) {
6179 for (Node child : children) {
6180 opsToProcess.add((Operator<? extends Serializable>)
child);
6181 }
6182 }
why is the above code block needed ? TableScan can only be at the top.
Also, can you check for Conditional Tasks in addition to MapRedTask ?
> Automatically gathering stats when reading a table/partition
> ------------------------------------------------------------
>
> Key: HIVE-1648
> URL: https://issues.apache.org/jira/browse/HIVE-1648
> Project: Hive
> Issue Type: Sub-task
> Reporter: Ning Zhang
> Assignee: Paul Butler
> Attachments: HIVE-1648.2.patch, HIVE-1648.3.patch, HIVE-1648.patch
>
>
> HIVE-1361 introduces a new command 'ANALYZE TABLE T COMPUTE STATISTICS' to
> gathering stats. This requires additional scan of the data. Stats gathering
> can be piggy-backed on TableScanOperator whenever a table/partition is
> scanned (given not LIMIT operator).
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