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https://issues.apache.org/jira/browse/DRILL-2738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14491797#comment-14491797
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Jacques Nadeau commented on DRILL-2738:
---------------------------------------
Since they are logically equivalent, there is no logical guarantee of what
comes first when you have them all in the same query. Yes, the other query
should guarantee what you're looking for.
> Offset with casting a column to timestamp not working
> -----------------------------------------------------
>
> Key: DRILL-2738
> URL: https://issues.apache.org/jira/browse/DRILL-2738
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Venkata krishnan Sowrirajan
>
> In the below query, it should skip the first row which is a header and want
> to cast one of the column to timestamp. But it is trying to parse the first
> row to cast it to timestamp. Without casting it to timestamp, simple offset
> query works fine.
> "select cast(columns[0] as timestamp) from
> `guts-csv/CSV/guts_run_lab-app002.csv` offset 1;"
> So I did explain plan on the above query
> explain plan without implementation for select cast(columns[0] as timestamp)
> from `guts-csv/CSV/guts_run_lab-app002.csv` offset 1;
> DrillScreenRel
> DrillLimitRel(offset=[1])
> DrillProjectRel(EXPR$0=[CAST(ITEM($0, 0)):TIMESTAMP(0)])
> DrillScanRel(table=[[fs, drill, guts-csv/CSV/guts_run_lab-app002.csv]],
> groupscan=[EasyGroupScan
> [selectionRoot=/mapr/yarn-test/drill/guts-csv/CSV/guts_run_lab-app002.csv,
> numFiles=1, columns=[`columns`[0]],
> files=[file:/mapr/yarn-test/drill/guts-csv/CSV/guts_run_lab-app002.csv]]])
> In the plan, it looks like it tries to do casting to timestamp and then the
> offset operation which is why its failing.
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