HV00AERRORTier 2 — Caution✅ HIGH confidence

fdw_invalid_string_format

Category: Foreign Data Wrapper ErrorVersions: PostgreSQL 9.1+

What this means

A string passed to or returned from a foreign data wrapper has an invalid or unexpected format that the FDW cannot parse or process.

1FDW received a string value in a format it does not recognise
2Option value provided in CREATE SERVER or CREATE FOREIGN TABLE has wrong syntax
3Remote server returned data in an unexpected string format
4Custom FDW code failed to validate string input before processing

Querying a foreign table or configuring FDW options with an invalid string format

trigger — this will ERROR

ALTER SERVER myserver OPTIONS (SET connection_string 'host=?bad??format');

ERROR: HV00A: fdw_invalid_string_format

An option value has wrong syntax

fix

SELECT srvname, srvoptions FROM pg_foreign_server WHERE srvname = 'myserver';

Why this works

Inspect and correct the option string to match the FDW specification

✗

Do not pass free-form strings to FDW options without validation

Why it's wrong: FDWs have strict format requirements for connection strings and option values

🔧 Source ref: https://www.postgresql.org/docs/current/errcodes-appendix.html

✅ HIGH confidence

Standard FDW error code from official PostgreSQL appendix.