HV024ERRORTier 2 — Caution✅ HIGH confidencefdw_invalid_attribute_value
What this means
A foreign data wrapper received an attribute (column) value that is invalid, out of range, or incompatible with the expected type for that attribute.
Why it happens
- 1Remote column contains a value that cannot be cast to the local column type
- 2FDW option attribute value is outside the allowed range (e.g. fetch_size = -1)
- 3NULL value received for a NOT NULL local column
- 4Remote server returned a value in an unexpected encoding
How to reproduce
Fetching data from a foreign table or setting a FDW attribute with an invalid value
ALTER FOREIGN TABLE my_ft OPTIONS (SET fetch_size '-1');Fix 1: Use a valid attribute value
FDW option value is out of range
ALTER FOREIGN TABLE my_ft OPTIONS (SET fetch_size '100');Why this works
Sets the attribute to a value within the FDW-accepted range
Fix 2: Check remote column types for compatibility
Remote data cannot be cast to local type
SELECT column_name, data_type FROM information_schema.columns WHERE table_name = 'remote_table';Why this works
Identifies type mismatches between remote and local foreign table definitions
What not to do
Do not use negative values for size/count FDW options
Why it's wrong: Most FDWs require positive integers for options like fetch_size, batch_size
Sources
📚 Official docs: https://www.postgresql.org/docs/current/postgres-fdw.html
🔧 Source ref: https://www.postgresql.org/docs/current/errcodes-appendix.html
Confidence assessment
✅ HIGH confidence
Standard FDW error code from official PostgreSQL appendix.
See also
📄 Reference pages