remove null / nan related operations

Author: cherylEnkidu

Firestore/Swift/Source/ExpressionImplementation.swift

@@ -615,14 +615,6 @@ public extension Expression {
 
   // --- Added Type Check Operations ---
 
-  func isNan() -> BooleanExpression {
-    return BooleanExpression(functionName: "is_nan", args: [self])
-  }
-
-  func isNil() -> BooleanExpression {
-    return BooleanExpression(functionName: "is_null", args: [self])
-  }
-
   func exists() -> BooleanExpression {
     return BooleanExpression(functionName: "exists", args: [self])
   }
@@ -635,14 +627,6 @@ public extension Expression {
     return BooleanExpression(functionName: "is_absent", args: [self])
   }
 
-  func isNotNil() -> BooleanExpression {
-    return BooleanExpression(functionName: "is_not_null", args: [self])
-  }
-
-  func isNotNan() -> BooleanExpression {
-    return BooleanExpression(functionName: "is_not_nan", args: [self])
-  }
-
   // --- Added String Operations ---
 
   func join(delimiter: String) -> FunctionExpression {

Firestore/Swift/Source/SwiftAPI/Pipeline/Expressions/Expression.swift

@@ -617,26 +617,6 @@ public protocol Expression: Sendable {
   /// - Returns: A `BooleanExpression` that can be used in `where` clauses.
   func notEqualAny(_ arrayExpression: Expression) -> BooleanExpression
 
-  /// Creates an expression that checks if this expression evaluates to "NaN" (Not a Number).
-  ///
-  /// ```swift
-  /// // Check if the result of a calculation is NaN
-  /// Field("value").divide(0).isNan()
-  /// ```
-  ///
-  /// - Returns: A new `BooleanExpression` representing the "isNaN" check.
-  func isNan() -> BooleanExpression
-
-  /// Creates an expression that checks if this expression evaluates to "Nil".
-  ///
-  /// ```swift
-  /// // Check if the "optionalField" is null
-  /// Field("optionalField").isNil()
-  /// ```
-  ///
-  /// - Returns: A new `BooleanExpression` representing the "isNil" check.
-  func isNil() -> BooleanExpression
-
   /// Creates an expression that checks if a field exists in the document.
   ///
   /// ```swift
@@ -668,27 +648,6 @@ public protocol Expression: Sendable {
   /// - Returns: A new `BooleanExpression` representing the "isAbsent" check.
   func isAbsent() -> BooleanExpression
 
-  /// Creates an expression that checks if the result of this expression is not null.
-  ///
-  /// ```swift
-  /// // Check if the value of the "name" field is not null
-  /// Field("name").isNotNil()
-  /// ```
-  ///
-  /// - Returns: A new `BooleanExpression` representing the "isNotNil" check.
-  func isNotNil() -> BooleanExpression
-
-  /// Creates an expression that checks if the results of this expression is NOT "NaN" (Not a
-  /// Number).
-  ///
-  /// ```swift
-  /// // Check if the result of a calculation is NOT NaN
-  /// Field("value").divide(Field("count")).isNotNan() // Assuming count might be 0
-  /// ```
-  ///
-  /// - Returns: A new `BooleanExpr` representing the "isNotNaN" check.
-  func isNotNan() -> BooleanExpression
-
   // MARK: String Operations
 
   /// Creates an expression that joins the elements of an array of strings with a given separator.

Firestore/Swift/Tests/Integration/PipelineTests.swift

@@ -2507,11 +2507,7 @@ class PipelineIntegrationTests: FSTIntegrationTestCase {
       .limit(1)
       .select(
         [
-          Field("rating").isNil().as("ratingIsNull"),
-          Field("rating").isNan().as("ratingIsNaN"),
           Field("foo").isAbsent().as("isAbsent"),
-          Field("title").isNotNil().as("titleIsNotNull"),
-          Field("cost").isNotNan().as("costIsNotNan"),
           Field("fooBarBaz").exists().as("fooBarBazExists"),
           Field("title").exists().as("titleExists"),
         ]
@@ -2522,11 +2518,7 @@ class PipelineIntegrationTests: FSTIntegrationTestCase {
 
     if let resultDoc = snapshot.results.first {
       let expectedResults: [String: Sendable?] = [
-        "ratingIsNull": false,
-        "ratingIsNaN": false,
         "isAbsent": true,
-        "titleIsNotNull": true,
-        "costIsNotNan": false,
         "fooBarBazExists": false,
         "titleExists": true,
       ]