EC
HV00A
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence

fdw_invalid_string_format

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.

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

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

trigger — this will error
trigger — this will error
ALTER SERVER myserver OPTIONS (SET connection_string 'host=?bad??format');

expected output

ERROR:  HV00A: fdw_invalid_string_format

Fix

Check FDW option string format

WHEN An option value has wrong syntax

Check FDW option string format
SELECT srvname, srvoptions FROM pg_foreign_server WHERE srvname = 'myserver';

Why this works

Inspect and correct the option string to match the FDW specification

What not to do

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

FDWs have strict format requirements for connection strings and option values

Sources
Official documentation ↗

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

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