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From "Venkata krishnan Sowrirajan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2738) Offset with casting a column to timestamp not working
Date Thu, 09 Apr 2015 20:05:12 GMT
Venkata krishnan Sowrirajan created DRILL-2738:

             Summary: 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;

    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]],

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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