feat: Add div operator for fuzz testing and update expression doc (#1464)

Author: wForget

docs/source/user-guide/expressions.md

@@ -35,13 +35,14 @@ The following Spark expressions are currently available. Any known compatibility
 
 ## Binary Arithmetic
 
-| Expression      | Notes |
-| --------------- | ----- |
-| Add (`+`)       |       |
-| Subtract (`-`)  |       |
-| Multiply (`*`)  |       |
-| Divide (`/`)    |       |
-| Remainder (`%`) |       |
+| Expression             | Notes |
+|------------------------| ----- |
+| Add (`+`)              |       |
+| Subtract (`-`)         |       |
+| Multiply (`*`)         |       |
+| Divide (`/`)           |       |
+| IntegralDivide (`div`) |       |
+| Remainder (`%`)        |       |
 
 ## Conditional Expressions
 

fuzz-testing/src/main/scala/org/apache/comet/fuzz/Meta.scala

@@ -132,7 +132,8 @@ object Meta {
 
   val unaryArithmeticOps: Seq[String] = Seq("+", "-")
 
-  val binaryArithmeticOps: Seq[String] = Seq("+", "-", "*", "/", "%", "&", "|", "^", "<<", ">>")
+  val binaryArithmeticOps: Seq[String] =
+    Seq("+", "-", "*", "/", "%", "&", "|", "^", "<<", ">>", "div")
 
   val comparisonOps: Seq[String] = Seq("=", "<=>", ">", ">=", "<", "<=")