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