Fix reading rows when using interactive (streaming) queries

Author: Kayrnt

.changes/unreleased/Fixes-20251030-001010.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Fix reading rows when using interactive (streaming) queries
+time: 2025-10-30T00:10:10.751126+01:00
+custom:
+    Author: Kayrnt
+    Issue: ""

src/deltastream/api/rows.py

@@ -38,7 +38,12 @@ def castRowData(
 
     for i, column in enumerate(columns):
         row_data_string = row_data_strings[i]
-        value = row_data_string.actual_instance
+        # Handle both ResultSetDataInnerInner objects and plain values (from WebSocket)
+        if hasattr(row_data_string, 'actual_instance'):
+            value = row_data_string.actual_instance
+        else:
+            value = row_data_string
+            
         if value is None:
             row_data.append(None)
             continue

src/deltastream/api/streaming_rows.py

@@ -68,7 +68,9 @@ async def open(self) -> None:
 
         async def handle_messages():
             try:
-                ws = await ws_connect(self.req.uri)
+                # Convert HTTPS URL to WSS for WebSocket connection
+                ws_uri = self.req.uri.replace("https://", "wss://", 1)
+                ws = await ws_connect(ws_uri)
                 self.ws = ws
 
                 # Send authentication
@@ -86,7 +88,27 @@ async def handle_messages():
                     data = json.loads(message)
 
                     if data["type"] == "metadata":
-                        self.metadata = PrintTopicMetadata(**data)
+                        # Convert column dictionaries to Column objects
+                        columns = []
+                        for col in data.get("columns", []):
+                            if isinstance(col, dict):
+                                # Provide default value for nullable if missing
+                                columns.append(Column(
+                                    name=col.get("name", ""),
+                                    type=col.get("type", ""),
+                                    nullable=col.get("nullable", True),  # Default to True if not specified
+                                    length=col.get("length"),
+                                    precision=col.get("precision"),
+                                    scale=col.get("scale"),
+                                ))
+                            else:
+                                columns.append(col)
+                        
+                        self.metadata = PrintTopicMetadata(
+                            type=data["type"],
+                            headers=data.get("headers", {}),
+                            columns=columns,
+                        )
                         deferred_ready.resolve()
 
                     elif data["type"] == "data":
@@ -124,17 +146,7 @@ def columns(self) -> List[Column]:
         if self.metadata is None:
             return []
 
-        return [
-            Column(
-                name=column.name,
-                type=column.type,
-                nullable=column.nullable,
-                length=column.length,
-                precision=column.precision,
-                scale=column.scale,
-            )
-            for column in self.metadata.columns
-        ]
+        return self.metadata.columns
 
     async def close(self) -> None:
         """Closes the WebSocket connection."""