[jira] [Resolved] (SPARK-22729) Add getTruncateQuery to JdbcDialect

["Xiao Li (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiao Li resolved SPARK-22729.
-----------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

> Add getTruncateQuery to JdbcDialect
> -----------------------------------
>
>                 Key: SPARK-22729
>                 URL: https://issues.apache.org/jira/browse/SPARK-22729
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 2.2.1
>            Reporter: Daniel van der Ende
>            Assignee: Daniel van der Ende
>             Fix For: 2.3.0
>
>
> In order to enable truncate for PostgreSQL databases in Spark JDBC, a change is needed to the query used for truncating a PostgreSQL table. By default, PostgreSQL will automatically truncate any descendant tables if a TRUNCATE query is executed. As this may result in (unwanted) side-effects, the query used for the truncate should be specified separately for PostgreSQL, specifying only to TRUNCATE a single table.
> This will also resolve SPARK-22717
> See PostgreSQL documentation https://www.postgresql.org/docs/current/static/sql-truncate.html
> This change will still not let users truncate a table with cascade enabled (which would also truncate tables with foreign key constraints to the table).



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