wangyum opened a new pull request #25214: [SPARK-28461][SQL] Pad Decimal numbers with trailing zeros to the scale of the column URL: https://github.com/apache/spark/pull/25214 ## What changes were proposed in this pull request? **Spark SQL**: ```sql spark-sql> select cast(1 as decimal(38, 18)); 1 spark-sql> scala> spark.sql("select cast(1 as decimal(38, 18))").show(false) +-------------------------+ |CAST(1 AS DECIMAL(38,18))| +-------------------------+ |1.000000000000000000 | +-------------------------+ ``` **PostgreSQL**: ```sql postgres=# select cast(1 as decimal(38, 18)); numeric ---------------------- 1.000000000000000000 (1 row) ``` **Presto**: ```sql presto> select cast(1 as decimal(38, 18)); _col0 ---------------------- 1.000000000000000000 (1 row) ``` Hive fixed this issue by [HIVE-12063](https://issues.apache.org/jira/browse/HIVE-12063). This pr fix this issue. After this pr: ```sql spark-sql> select cast(1 as decimal(38, 18)); 1.000000000000000000 ``` ## How was this patch tested? unit tests
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