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https://issues.apache.org/jira/browse/SPARK-23906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16614307#comment-16614307
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Yuming Wang commented on SPARK-23906:
-------------------------------------
cc [~dongjoon]
It's difficult to reuse {{trunc}} for truncating numbers. How about introduce a
new name: {{truncate}}?
{code:sql}
mysql> SELECT TRUNCATE(1.223,1);
-> 1.2
mysql> SELECT TRUNCATE(1.999,1);
-> 1.9
mysql> SELECT TRUNCATE(1.999,0);
-> 1
mysql> SELECT TRUNCATE(-1.999,1);
-> -1.9
mysql> SELECT TRUNCATE(122,-2);
-> 100
mysql> SELECT TRUNCATE(10.28*100,0);
-> 1028
{code}
[https://dev.mysql.com/doc/refman/8.0/en/mathematical-functions.html#function_truncate]
> Add UDF trunc(numeric)
> ----------------------
>
> Key: SPARK-23906
> URL: https://issues.apache.org/jira/browse/SPARK-23906
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Xiao Li
> Assignee: Yuming Wang
> Priority: Major
>
> https://issues.apache.org/jira/browse/HIVE-14582
> We already have {{date_trunc}} and {{trunc}}. Need to discuss whether we
> should introduce a new name or reuse {{trunc}} for truncating numbers.
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