Merge pull request #153 from Azure/add_support_for_rand_and_has_any_experssions

Implementing review comments

pykusto/_src/expressions.py

@@ -523,9 +523,10 @@ class _StringExpression(BaseExpression):
             f'{self.as_subexpression()} {"!has_cs" if case_sensitive else "!has"} {_to_kql(exp, True)}'
         ))
 
-    def has_any(self, other: ArrayType) -> '_BooleanExpression':
+    def has_any(self, other: Union[List, Tuple]) -> '_BooleanExpression':
         """
         https://docs.microsoft.com/en-us/azure/data-explorer/kusto/query/has-anyoperator
+        Please notice that this implementation does not support tabular expression inputs currently
         """
         assert isinstance(other, (List, Tuple)), "Compared array must be a list of tabular, scalar, or literal expressions"
         return _BooleanExpression(KQL(f'{self.kql} has_any ({", ".join(map(_to_kql, other))})'))

pykusto/_src/functions.py

@@ -648,6 +648,9 @@ class Functions:
 
     @staticmethod
     def rand(n: NumberType = None):
+        """
+        https://docs.microsoft.com/en-us/azure/data-explorer/kusto/query/randfunction
+        """
         return _NumberExpression(KQL("rand()") if n is None else f'rand({_to_kql(n)})')
 
     # def range(self): return