[SPARK-45909][SQL] Remove NumericType cast if it can safely up-cast in IsNotNull

### What changes were proposed in this pull request?

Similar to SPARK-37922. We can remove the cast if it can safely up-cast in `IsNotNull`.

### Why are the changes needed?

Improve the query performance.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Unit test.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes apache#43785 from wangyum/SPARK-45909.

Authored-by: Yuming Wang <yumwang@ebay.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

Author: wangyum

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala

@@ -1063,6 +1063,8 @@ object SimplifyCasts extends Rule[LogicalPlan] {
         if fromKey == toKey && fromValue == toValue => e
       case _ => c
       }
+    case IsNotNull(Cast(e, dataType: NumericType, _, _)) if isWiderCast(e.dataType, dataType) =>
+      IsNotNull(e)
   }
 
   // Returns whether the from DataType can be safely casted to the to DataType without losing

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/SimplifyCastsSuite.scala

@@ -117,4 +117,25 @@ class SimplifyCastsSuite extends PlanTest {
         input.select($"d".cast(LongType).cast(StringType).as("casted")).analyze),
       input.select($"d".cast(LongType).cast(StringType).as("casted")).analyze)
   }
+
+  test("SPARK-45909: Remove the cast if it can safely up-cast in IsNotNull") {
+    val input = LocalRelation($"a".int, $"b".decimal(18, 0))
+    // Remove cast
+    comparePlans(
+      Optimize.execute(
+        input.select($"a".cast(DecimalType(18, 1)).isNotNull.as("v")).analyze),
+      input.select($"a".isNotNull.as("v")).analyze)
+    comparePlans(
+      Optimize.execute(input.select($"a".cast(LongType).isNotNull.as("v")).analyze),
+      input.select($"a".isNotNull.as("v")).analyze)
+    comparePlans(
+      Optimize.execute(input.select($"b".cast(LongType).isNotNull.as("v")).analyze),
+      input.select($"b".isNotNull.as("v")).analyze)
+
+    // Can not remove cast
+    comparePlans(
+      Optimize.execute(
+        input.select($"a".cast(DecimalType(2, 1)).as("v")).analyze),
+      input.select($"a".cast(DecimalType(2, 1)).as("v")).analyze)
+  }
 }