chore: remove unused raise_on_invalid_filter_syntax utility function

Author: anakin87

haystack/utils/__init__.py

@@ -14,7 +14,7 @@
     "callable_serialization": ["deserialize_callable", "serialize_callable"],
     "device": ["ComponentDevice", "Device", "DeviceMap", "DeviceType"],
     "deserialization": ["deserialize_chatgenerator_inplace", "deserialize_component_inplace"],
-    "filters": ["document_matches_filter", "raise_on_invalid_filter_syntax"],
+    "filters": ["document_matches_filter"],
     "jinja2_extensions": ["Jinja2TimeExtension"],
     "jupyter": ["is_in_jupyter"],
     "misc": ["expit", "expand_page_range"],
@@ -37,7 +37,6 @@
     from .device import DeviceMap as DeviceMap
     from .device import DeviceType as DeviceType
     from .filters import document_matches_filter as document_matches_filter
-    from .filters import raise_on_invalid_filter_syntax as raise_on_invalid_filter_syntax
     from .jinja2_extensions import Jinja2TimeExtension as Jinja2TimeExtension
     from .jupyter import is_in_jupyter as is_in_jupyter
     from .misc import expand_page_range as expand_page_range

haystack/utils/filters.py

@@ -12,15 +12,6 @@
 from haystack.errors import FilterError
 
 
-def raise_on_invalid_filter_syntax(filters: dict[str, Any] | None = None) -> None:
-    """
-    Raise an error if the filter syntax is invalid.
-    """
-    if filters and ("operator" not in filters or "conditions" not in filters):
-        msg = "Invalid filter syntax. See https://docs.haystack.deepset.ai/docs/metadata-filtering for details."
-        raise FilterError(msg)
-
-
 def document_matches_filter(filters: dict[str, Any], document: Document | ByteStream) -> bool:
     """
     Return whether `filters` match the Document or the ByteStream.

releasenotes/notes/rm-raise_on_invalid_filter_syntax-a1e88026e3f6c6b0.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    The ``raise_on_invalid_filter_syntax`` utility function has been removed. Its implementation was incorrect
+    and never used across Haystack and Haystack Core Integrations.