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https://issues.apache.org/jira/browse/DRILL-2669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14526920#comment-14526920
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Daniel Barclay (Drill) commented on DRILL-2669:
-----------------------------------------------
> Sudhakar Thota, can you review your description. I'm finding it hard to
> figure out what is what in this bug.
+1
Regarding your "Case -1.Successful case." section:
What was the output from execution of the SELECT statement (as opposed to the
EXPLAIN statement that is included)?
Regarding your "Case -2. Unsuccessful case:" section:
The second block shows a table of query results. What exactly is unsuccessful
in that block?
The last three blocks seem to show exactly the same query, but the results are
different for the first and third. What was different between the first and
third case? Was there different input data?
The second-to-last block shows a query, but no further output (neither error
message nor result table). What is that second-to-last block meant to show?
> Error happening without limit clause and works with limit clause
> ----------------------------------------------------------------
>
> Key: DRILL-2669
> URL: https://issues.apache.org/jira/browse/DRILL-2669
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Affects Versions: 0.8.0
> Environment: mapr sandbox 4.0.2
> Reporter: Sudhakar Thota
> Assignee: Daniel Barclay (Drill)
> Fix For: 1.0.0
>
>
> Perhaps this could be a bug. I get the same results.
> But the plan is very different, the UnionExchange is set up immediately after
> the scan operation in successful case( Case 1 ), where as UnionExchange is
> happening after scan>project (Case -2).
> Case -1.Successful case.
> {code}
> 0: jdbc:drill:> explain plan for select to_timestamp(t.t,
> 'YYYY-MM-dd''T''HH:mm:ss.SSS''Z''') FROM (select * from
> dfs.sthota_prq.`/tstamp_test/*.parquet` limit 13015351) t;
> ----------------------+
> text json
> ----------------------+
> 00-00 Screen
> 00-01 Project(EXPR$0=[TO_TIMESTAMP(ITEM($0, 't'),
> 'YYYY-MM-dd''T''HH:mm:ss.SSS''Z''')])
> 00-02 SelectionVectorRemover
> 00-03 Limit(fetch=[13015351])
> 00-04 UnionExchange
> 01-01 Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath
> [path=maprfs:/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test/1_2_0.parquet],
> ReadEntryWithPath
> [path=maprfs:/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test/1_1_0.parquet],
> ReadEntryWithPath
> [path=maprfs:/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test/1_0_0.parquet]],
> selectionRoot=/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test,
> numFiles=3, columns=[`*`]]])
> {
> "head" :
> Unknown macro: { "version" }
> ,
> {code}
> Case -2. Unsuccessful case:
> {code}
> 0: jdbc:drill:> explain plan for select to_timestamp(t.t,
> 'YYYY-MM-dd''T''HH:mm:ss.SSS''Z''') FROM (select * from
> dfs.sthota_prq.`/tstamp_test/*.parquet` ) t;
> ----------------------+
> text json
> ----------------------+
> 00-00 Screen
> 00-01 UnionExchange
> 01-01 Project(EXPR$0=[TO_TIMESTAMP(ITEM($0, 't'),
> 'YYYY-MM-dd''T''HH:mm:ss.SSS''Z''')])
> 01-02 Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath
> [path=maprfs:/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test/1_2_0.parquet],
> ReadEntryWithPath
> [path=maprfs:/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test/1_1_0.parquet],
> ReadEntryWithPath
> [path=maprfs:/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test/1_0_0.parquet]],
> selectionRoot=/mapr/demo.mapr.com/user/sthota/parquet/tstamp_test,
> numFiles=3, columns=[`*`]]])
> {
> "head" :
> Unknown macro: { "version" }
> ,
> {code}
> {code}
> 0: jdbc:drill:> select to_timestamp(t.t, 'YYYY-MM-dd''T''HH:mm:ss.SSS''Z''')
> FROM (select * from dfs.sthota_prq.`/tstamp_test/*.parquet` limit 10) t;
> ------------
> EXPR$0
> ------------
> 2015-01-27 13:43:53.0
> 2015-01-27 13:43:49.0
> 2015-01-27 13:43:47.0
> 2015-01-27 13:43:47.0
> 2015-01-27 13:43:47.0
> 2015-01-27 13:43:45.0
> 2015-01-27 13:43:43.0
> 2015-01-27 13:43:43.0
> 2015-01-27 13:43:43.0
> 2015-01-27 13:43:39.0
> ------------
> 10 rows selected (1.127 seconds)
> {code}
> {code}
> 0: jdbc:drill:> select to_timestamp(t.t, 'YYYY-MM-dd''T''HH:mm:ss.SSS''Z''')
> FROM (select * from dfs.sthota_prq.`/tstamp_test/*.parquet`) t;
> {code}
> {code}
> 0: jdbc:drill:> select to_timestamp(t.t, 'YYYY-MM-dd''T''HH:mm:ss.SSS''Z''')
> FROM (select * from dfs.sthota_prq.`/tstamp_test/*.parquet`) t;
> Query failed: RemoteRpcException: Failure while trying to start remote
> fragment, Expression has syntax error! line 1:30:mismatched input 'T'
> expecting CParen [ ab817e5a-9b74-47dd-b3c6-3bbf025c7de9 on maprdemo:31010 ]
> Error: exception while executing query: Failure while executing query.
> (state=,code=0)
> {code}
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