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https://issues.apache.org/jira/browse/SPARK-39238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Manu Zhang updated SPARK-39238:
-------------------------------
    Description: 
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}

  was:
The result of following SQL is 1.00 while 1.00000000000000000000 is expected
{code:java}
CREATE OR REPLACE TEMPORARY VIEW t4 AS SELECT CAST(v AS DECIMAL(18, 2)) AS v 
FROM t3;
SELECT v / v FROM t4;

SELECT CAST(1 AS DECIMAL(28, 2))
UNION ALL
SELECT v / v FROM t4; {code}


> 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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