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https://issues.apache.org/jira/browse/SPARK-24940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li updated SPARK-24940:
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Target Version/s: 2.4.0
> Coalesce Hint for SQL Queries
> -----------------------------
>
> Key: SPARK-24940
> URL: https://issues.apache.org/jira/browse/SPARK-24940
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.1
> Reporter: John Zhuge
> Priority: Major
>
> Many Spark SQL users in my company have asked for a way to control the number
> of output files in Spark SQL. The users prefer not to use function
> repartition\(n\) or coalesce(n, shuffle) that require them to write and
> deploy Scala/Java/Python code.
>
> There are use cases to either reduce or increase the number.
>
> The DataFrame API has repartition/coalesce for a long time. However, we do
> not have an equivalent functionality in SQL queries. We propose adding the
> following Hive-style Coalesce hint to Spark SQL.
> {noformat}
> /*+ COALESCE(n, shuffle) */
> /*+ REPARTITION(n) */
> {noformat}
> REPARTITION\(n\) is equal to COALESCE(n, shuffle=true).
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