EC
HV00M
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence

fdw_unable_to_create_reply

What this means

A foreign data wrapper was unable to create a reply object to receive results from the remote server after initiating query execution.

Why it happens
  1. 1Memory allocation failure when creating the reply structure
  2. 2Remote server closed the connection immediately after execution started
  3. 3FDW implementation error in the reply creation path
  4. 4Protocol mismatch between FDW and remote server version
How to reproduce

FDW query execution when result retrieval infrastructure cannot be created

trigger — this will error
trigger — this will error
SELECT * FROM my_foreign_table;

expected output

ERROR:  HV00M: fdw_unable_to_create_reply

Fix

Check remote server version compatibility

WHEN Protocol mismatch suspected

Check remote server version compatibility
SELECT version() FROM foreign_version_table;

Why this works

Confirms FDW and remote server are using compatible protocol versions

What not to do

✕ Do not assume the issue is local

This error originates at the FDW-to-remote boundary, not in local PostgreSQL

Sources
Official documentation ↗

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

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