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From "Xiao Meng (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-884) Query used to derive result set metadata for Tableau's "Custom SQL" does not run
Date Thu, 19 Jun 2014 19:18:26 GMT

     [ https://issues.apache.org/jira/browse/DRILL-884?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Meng updated DRILL-884:
----------------------------

    Description: 
The following style of query is used by Tableau to derive the metadata of a custom SQL:

>From Tableau's protocol server log:
{code}
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocol::ReadMetadataImpl: Attempting to read
metadata from the prepared / executed query result set.
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: Reading metadata
using a prepared statement.
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: <QUERY protocol='0367b1f0'>
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: SELECT *
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: FROM (
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0:   select * from dfs.`default`.`/opt/drill/raw-files/click1.json`
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ) `TableauSQL`
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: WHERE (0 = 1)
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: </QUERY>
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: SQLPrepare failed.
Reading metadata using an executed query.
2014-05-30 18:35:47.640 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: No columns were
reported!
{code}


*Updated to avoid confusion:*

The above query is not the problem for the json file. It is because the query fails for the
json file.
{code}
SELECT `TableauSQL`.`address` AS `address`,
  `TableauSQL`.`br` AS `br`,
  `TableauSQL`.`first_visit` AS `first_visit`,
  `TableauSQL`.`gender` AS `gender`,
  `TableauSQL`.`id` AS `id`,
  `TableauSQL`.`la` AS `la`,
  `TableauSQL`.`name` AS `name`,
  `TableauSQL`.`os` AS `os`,
  `TableauSQL`.`st` AS `st`,
  `TableauSQL`.`user_category` AS `user_category`
FROM (
  select * from dfs.`default`.`/opt/drill/raw-files/click1.json`
) `TableauSQL`
{code}

However, there is a problem of Tableau generated metadata query in mult-region HBase table
(DRILL-1026). 

  was:
The following style of query is used by Tableau to derive the metadata of a custom SQL:

>From Tableau's protocol server log:
{code}
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocol::ReadMetadataImpl: Attempting to read
metadata from the prepared / executed query result set.
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: Reading metadata
using a prepared statement.
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: <QUERY protocol='0367b1f0'>
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: SELECT *
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: FROM (
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0:   select * from dfs.`default`.`/opt/drill/raw-files/click1.json`
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ) `TableauSQL`
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: WHERE (0 = 1)
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: </QUERY>
2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: SQLPrepare failed.
Reading metadata using an executed query.
2014-05-30 18:35:47.640 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: No columns were
reported!
{code}

*Updated to avoid confusion:*

The above query is not the problem for the json file. It is because the query fails for the
json file.
{code}
SELECT `TableauSQL`.`address` AS `address`,
  `TableauSQL`.`br` AS `br`,
  `TableauSQL`.`first_visit` AS `first_visit`,
  `TableauSQL`.`gender` AS `gender`,
  `TableauSQL`.`id` AS `id`,
  `TableauSQL`.`la` AS `la`,
  `TableauSQL`.`name` AS `name`,
  `TableauSQL`.`os` AS `os`,
  `TableauSQL`.`st` AS `st`,
  `TableauSQL`.`user_category` AS `user_category`
FROM (
  select * from dfs.`default`.`/opt/drill/raw-files/click1.json`
) `TableauSQL`
{code}

However, there is a problem of Tableau generated metadata query in mult-region HBase table
(DRILL-1026). 


> Query used to derive result set metadata for Tableau's "Custom SQL" does not run
> --------------------------------------------------------------------------------
>
>                 Key: DRILL-884
>                 URL: https://issues.apache.org/jira/browse/DRILL-884
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>            Reporter: George Chow
>            Assignee: Steven Phillips
>            Priority: Critical
>              Labels: Tableau
>             Fix For: 1.0.0-BETA1
>
>         Attachments: DRILL-884.patch
>
>
> The following style of query is used by Tableau to derive the metadata of a custom SQL:
> From Tableau's protocol server log:
> {code}
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocol::ReadMetadataImpl: Attempting to
read metadata from the prepared / executed query result set.
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: Reading metadata
using a prepared statement.
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: <QUERY protocol='0367b1f0'>
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: SELECT *
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: FROM (
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0:   select * from dfs.`default`.`/opt/drill/raw-files/click1.json`
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ) `TableauSQL`
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: WHERE (0 = 1)
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: </QUERY>
> 2014-05-30 18:35:39.718 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: SQLPrepare
failed. Reading metadata using an executed query.
> 2014-05-30 18:35:47.640 (-,-,-,-) 0ea0: ODBCProtocolImpl::ReadMetadataImpl: No columns
were reported!
> {code}
> *Updated to avoid confusion:*
> The above query is not the problem for the json file. It is because the query fails for
the json file.
> {code}
> SELECT `TableauSQL`.`address` AS `address`,
>   `TableauSQL`.`br` AS `br`,
>   `TableauSQL`.`first_visit` AS `first_visit`,
>   `TableauSQL`.`gender` AS `gender`,
>   `TableauSQL`.`id` AS `id`,
>   `TableauSQL`.`la` AS `la`,
>   `TableauSQL`.`name` AS `name`,
>   `TableauSQL`.`os` AS `os`,
>   `TableauSQL`.`st` AS `st`,
>   `TableauSQL`.`user_category` AS `user_category`
> FROM (
>   select * from dfs.`default`.`/opt/drill/raw-files/click1.json`
> ) `TableauSQL`
> {code}
> However, there is a problem of Tableau generated metadata query in mult-region HBase
table (DRILL-1026). 



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