EC
HV091
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence

fdw_invalid_descriptor_field_identifier

What this means

A foreign data wrapper used an invalid identifier to access a descriptor field, indicating an internal FDW implementation error in descriptor field access.

Why it happens
  1. 1FDW code accessed a descriptor field using an unrecognised or invalid field identifier
  2. 2Descriptor field identifier is out of range for the descriptor type
  3. 3FDW implementation uses a hard-coded field ID that does not match the current PostgreSQL version
How to reproduce

Internal FDW descriptor field access during query planning or execution

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

expected output

ERROR:  HV091: fdw_invalid_descriptor_field_identifier

Fix

Update the FDW to a version compatible with your PostgreSQL version

WHEN Descriptor field identifier mismatch after PostgreSQL upgrade

Update the FDW to a version compatible with your PostgreSQL version
ALTER EXTENSION my_fdw UPDATE;

Why this works

Ensures FDW uses correct descriptor field identifiers for the installed PostgreSQL version

What not to do

✕ Do not hard-code descriptor field IDs in custom FDW implementations

Field IDs can change across PostgreSQL versions; use the defined constants

Sources
Official documentation ↗

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

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