wangyum opened a new pull request #35220:
URL: https://github.com/apache/spark/pull/35220
### What changes were proposed in this pull request?
This pr improve `SimplifyCasts` to remove useless cast. For example:
```scala
spark.sql("CREATE TABLE t1 (id int) using parquet")
spark.sql("SELECT CAST(CAST(id AS DECIMAL(10, 0)) AS DECIMAL(12, 2)) FROM
t1").explain(true)
```
Before this pr:
```
== Optimized Logical Plan ==
Project [cast(cast(id#1 as decimal(10,0)) as decimal(12,2)) AS casted#0]
+- Relation default.t1[id#1] parquet
```
After this pr:
```
== Optimized Logical Plan ==
Project [cast(id#1 as decimal(12,2)) AS casted#0]
+- Relation default.t1[id#1] parquet
```
### Why are the changes needed?
Improve query performance.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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