EC
HV008
PostgreSQLERRORNotableForeign Data Wrapper ErrorHIGH confidence

FDW invalid column number

What this means

SQLSTATE HV008 is raised when a foreign data wrapper encounters an invalid column number — the column ordinal from the remote source falls outside the range of columns defined in the foreign table.

Why it happens
  1. 1The remote table has more or fewer columns than the local foreign table definition
  2. 2Remote schema changed and the column count no longer matches
How to reproduce

Column count mismatch between local and remote table.

expected output

ERROR:  FDW invalid column number

Fix

Re-import the foreign schema or update the foreign table definition

WHEN When remote schema changes have caused a column count mismatch.

Re-import the foreign schema or update the foreign table definition
-- Drop and reimport:
IMPORT FOREIGN SCHEMA public
  LIMIT TO (remote_table)
  FROM SERVER remote_pg
  INTO local_schema;

Why this works

IMPORT FOREIGN SCHEMA recreates the foreign table with the current remote column structure.

Sources
Official documentation ↗

Class HV — Foreign Data Wrapper Error

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