Fix/delta merge builder instance check for connect + util fix (#130)

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Additonal fixes for #101 and #102

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#101, #102

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---------

Co-authored-by: Danny Meijer <10511979+dannymeijer@users.noreply.github.com>

src/koheesio/spark/utils/connect.py

@@ -14,6 +14,9 @@ def is_remote_session(spark: Optional[SparkSession] = None) -> bool:
     result = False
 
     if (_spark := spark or get_active_session()) and check_if_pyspark_connect_is_supported():
-        result = True if _spark.conf.get("spark.remote", None) else False  # type: ignore
+        # result = True if _spark.conf.get("spark.remote", None) else False  # type: ignore
+        from pyspark.sql.connect.session import SparkSession as ConnectSparkSession
+
+        result = isinstance(_spark, ConnectSparkSession)
 
     return result

src/koheesio/spark/writers/delta/batch.py

@@ -323,7 +323,10 @@ def _validate_params(cls, params: dict) -> dict:
                     clause = merge_conf.get("clause")
                     if clause not in valid_clauses:
                         raise ValueError(f"Invalid merge clause '{clause}' provided")
-            elif not isinstance(merge_builder, DeltaMergeBuilder):
+            elif (
+                not isinstance(merge_builder, DeltaMergeBuilder)
+                or not type(merge_builder).__name__ == "DeltaMergeBuilder"
+            ):
                 raise ValueError("merge_builder must be a list or merge clauses or a DeltaMergeBuilder instance")
 
         return params
@@ -378,7 +381,7 @@ def execute(self) -> Writer.Output:
         if self.table.create_if_not_exists and not self.table.exists:
             _writer = _writer.options(**self.table.default_create_properties)
 
-        if isinstance(_writer, DeltaMergeBuilder):
+        if isinstance(_writer, DeltaMergeBuilder) or type(_writer).__name__ == "DeltaMergeBuilder":
             _writer.execute()
         else:
             if options := self.params: