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From "Daniel Barclay (Drill) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-2560) JDBC execute calls return asynchronously for DDLs
Date Tue, 04 Aug 2015 19:48:05 GMT

    [ https://issues.apache.org/jira/browse/DRILL-2560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654246#comment-14654246

Daniel Barclay (Drill) commented on DRILL-2560:


A workaround that should work in all cases is to make sure that, for any {{executeQuery(...)}}
call that it makes, client code calls {{next()}} (on the returned {{ResultSet}}) until {{next()}}
returns false (or throws an exception) before it calls {{executeQuery(...)}} again.

That should ensure that a query started earlier has finished executing before a query started
later begins to execute.

(If you only need to make sure that the first query is not canceled by beginning the second
query, and don't need the first query to complete before the second query begins, you can
execute the queries using separate Statement objects.)

> JDBC execute calls return asynchronously for DDLs
> -------------------------------------------------
>                 Key: DRILL-2560
>                 URL: https://issues.apache.org/jira/browse/DRILL-2560
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Client - JDBC
>    Affects Versions: 0.8.0
>            Reporter: Chris Westin
>            Assignee: Daniel Barclay (Drill)
>             Fix For: 1.3.0
> While working with TestViews, I noticed that JDBC's executeQuery() returns immediately
for drop view statements. For DDLs, users' expectation would be that the call would return
synchronously. The same would be true for execute(), and executeUpdate(), if used for DDLs.
This behavior is pretty typical for RDBMSs. This avoids the user having to consume the (non-)output
in order to wait for the statement to complete -- otherwise it will get cancelled when the
Statement is closed.

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