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https://issues.apache.org/jira/browse/SPARK-39238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17539919#comment-17539919
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Apache Spark commented on SPARK-39238:
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User 'manuzhang' has created a pull request for this issue:
https://github.com/apache/spark/pull/36615
> Decimal precision loss from applying WidenSetOperationTypes before
> DecimalPrecision
> ------------------------------------------------------------------------------------
>
> Key: SPARK-39238
> URL: https://issues.apache.org/jira/browse/SPARK-39238
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.3.1
> Reporter: Manu Zhang
> Priority: Major
>
> The result of following SQL is 1.00 while 1.00000000000000000000 is expected
> {code:java}
> CREATE OR REPLACE TEMPORARY VIEW t3 AS VALUES (decimal(1)) tbl(v)
> CREATE OR REPLACE TEMPORARY VIEW t4 AS SELECT CAST(v AS DECIMAL(18, 2)) AS v
> FROM t3;
> SELECT CAST(1 AS DECIMAL(28, 2))
> UNION ALL
> SELECT v / v FROM t4; {code}
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