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Title: fix: Remote Online Store Type Inference Error with All-NULL Columns by yuan1j · Pull Request #6063 · feast-dev/feast · GitHub

Open Graph Title: fix: Remote Online Store Type Inference Error with All-NULL Columns by yuan1j · Pull Request #6063 · feast-dev/feast

X Title: fix: Remote Online Store Type Inference Error with All-NULL Columns by yuan1j · Pull Request #6063 · feast-dev/feast

Description: What this PR does / why we need it 📋 Problem Description When reading features from a Feast Remote Online Store, a TypeError is raised if an entire feature column contains only NULL/NaN values. The error occurs in the python_values_to_proto_values() function when it cannot infer the value type from empty data. 🔍 Root Cause Analysis Component Issue Location feast/type_map.py - python_values_to_proto_values() function Trigger Entire feature column contains NULL/NaN values Reason Type inference fails when all values are empty, resulting in UNKNOWN value type Current Behavior Raises TypeError: Couldn't infer value type from empty value Impact Remote online feature reading fails completely 📊 Test Data Example event_timestamp driver_id conv_rate acc_rate avg_daily_trips 0 2026-03-04 16:17:44+00:00 1001 NaN 1.000000 1000.0 1 2026-02-17 16:00:00+00:00 1005 NaN 0.708060 395.0 2 2026-02-17 17:00:00+00:00 1005 NaN 0.451616 145.0 ⚠️ Note: The conv_rate column contains all NaN values. 💡 Solution Modify the type inference logic to handle UNKNOWN value types gracefully: Key Changes ✅ Do not raise error when value type is UNKNOWN ✅ Preserve schema-defined type from FeatureView definition ✅ Return proper NULL values in the response while maintaining type information Code Change Summary # Before if value_type is UNKNOWN: raise TypeError("Couldn't infer value type from empty value") # After # Remove this part code, and use schema-defined type or skip type inference for NULL-only columns ✨ Expected Behavior After this fix: ✅ Remote online store can read columns with all-NULL values ✅ Feature schema type is preserved from FeatureView definition ✅ NULL values are returned correctly to the client ✅ No breaking changes to existing functionality Which issue(s) this PR fixes Fixes: Remote Online Store Type Inference Error with All-NULL Columns Related Error: Traceback (most recent call last): File "C:\svn\project\feature_store\feast\remote\test_workflow.py", line 130, in run_demo() File "C:\svn\project\feature_store\feast\remote\test_workflow.py", line 25, in run_demo fetch_online_features(store) File "C:\svn\project\feature_store\feast\remote\test_workflow.py", line 121, in fetch_online_features returned_features = store.get_online_features( File "C:\Users\j\AppData\Local\Programs\Python\Python310\lib\site-packages\feast\feature_store.py", line 2445, in get_online_features response = provider.get_online_features( File "C:\Users\j\AppData\Local\Programs\Python\Python310\lib\site-packages\feast\infra\passthrough_provider.py", line 251, in get_online_features return self.online_store.get_online_features( File "C:\Users\j\AppData\Local\Programs\Python\Python310\lib\site-packages\feast\infra\online_stores\online_store.py", line 199, in get_online_features read_rows = self.online_read( File "C:\Users\j\AppData\Local\Programs\Python\Python310\lib\site-packages\feast\infra\online_stores\remote.py", line 169, in online_read message = python_values_to_proto_values( File "C:\Users\j\AppData\Local\Programs\Python\Python310\lib\site-packages\feast\type_map.py", line 838, in python_values_to_proto_values raise TypeError("Couldn't infer value type from empty value") TypeError: Couldn't infer value type from empty value Misc 🧪 Testing Manual Test Steps # 1. Start Feast services cd C:\svn\project\feature_store\feast\test\feature_repo feast ui feast serve_registry feast serve_offline feast serve # 2. Prepare test data with all-NULL column # (conv_rate column contains only NaN values) # 3. Run remote client python remote/test_workflow.py Configuration Used project: test registry: registry_type: remote path: 127.0.0.1:6570 provider: local online_store: type: remote path: http://127.0.0.1:6566 offline_store: type: remote host: 127.0.0.1 port: 8815 entity_key_serialization_version: 3 auth: type: no_auth 📝 Additional Notes Item Details Breaking Changes None API Changes None Documentation May need update for NULL handling behavior Unit Tests Should add test case for all-NULL column scenario Affected Components feast/type_map.py, feast/infra/online_stores/remote.py 👥 Reviewers @feast-maintainers @feast-infra-team ✅ Checklist Code follows Feast code conventions Unit tests added/updated Integration tests pass Documentation updated (if needed) Commits signed PR title follows conventional commits format

Open Graph Description: What this PR does / why we need it 📋 Problem Description When reading features from a Feast Remote Online Store, a TypeError is raised if an entire feature column contains only NULL/NaN values. The...

X Description: What this PR does / why we need it 📋 Problem Description When reading features from a Feast Remote Online Store, a TypeError is raised if an entire feature column contains only NULL/NaN values. The...

Opengraph URL: https://github.com/feast-dev/feast/pull/6063

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