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https://issues.apache.org/jira/browse/DRILL-1309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hanifi Gunes updated DRILL-1309:
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Attachment: DRILL-1309.1.patch.txt
> Projected columns are not pushed into scan
> -------------------------------------------
>
> Key: DRILL-1309
> URL: https://issues.apache.org/jira/browse/DRILL-1309
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Mehant Baid
> Assignee: Hanifi Gunes
> Fix For: 0.5.0
>
> Attachments: DRILL-1309.1.patch.txt
>
>
> While performing the following query on two text files, the projected column
> does not get pushed into the scan.
> explain plan for select t1.columns[1] from dfs.`/tmp/t1.csv` t1,
> dfs.`/tmp/t2.csv` t2 where t1.columns[0] = t2.columns[0];
> 00-00 Screen
> 00-01 Project(EXPR$0=[ITEM($0, 1)])
> 00-02 HashJoin(condition=[=($1, $2)], joinType=[inner])
> 00-04 Project(columns=[$0], $f2=[ITEM($0, 0)])
> 00-06 Scan(groupscan=[EasyGroupScan [selectionRoot=/tmp/t1.csv,
> columns = [SchemaPath [`columns`], SchemaPath [`columns`[0]]]]])
> 00-03 Project($f20=[$0])
> 00-05 Project($f2=[ITEM($0, 0)])
> 00-07 Scan(groupscan=[EasyGroupScan [selectionRoot=/tmp/t2.csv,
> columns = [SchemaPath [`columns`[0]]]]])
> In the above plan (00-06) we see that the scan contains the following column
> projections pushed into scan: 'columns' and 'columns[0]'.
> We should not push 'columns' into the scan, instead push 'columns[1]' which
> is the projected column into the scan.
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