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https://issues.apache.org/jira/browse/HIVE-14143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15361156#comment-15361156
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Nemon Lou commented on HIVE-14143:
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[~pxiong] The "ids" passed in is just "sizeOfColumnsInTableScan" in many
places.So "ids.size() != *sizeOfColumnsInTableScan" will always be false.
{code}
ColumnProjectionUtils.appendReadColumns(
jobConf, ts.getNeededColumnIDs(), ts.getNeededColumns());
{code}
In the case of count(1) or stats gather,"sizeOfColumnsInTableScan" is zero.We
need to find a way to distinguish these two cases.
For count(1), READ_ALL_COLUMNS should be set to false.
For stat gather of rcfile,READ_ALL_COLUMNS should be set to true in order to
read all columns and then calculate rawDataSize.
> RawDataSize of RCFile is zero after analyze
> --------------------------------------------
>
> Key: HIVE-14143
> URL: https://issues.apache.org/jira/browse/HIVE-14143
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Affects Versions: 1.2.1, 2.1.0
> Reporter: Nemon Lou
> Assignee: Abhishek
> Priority: Minor
> Attachments: HIVE-14143.1.patch, HIVE-14143.patch
>
>
> After running the following analyze command ,rawDataSize becomes zero for
> rcfile tables.
> {noformat}
> analyze table RCFILE_TABLE compute statistics ;
> {noformat}
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