PostgreSQL fdw_invalid_column_name (HV007) Error Explained and Fixed

What is fdw_invalid_column_name (HV007)?<\/h3>

The fdw_invalid_column_name condition is raised by PostgreSQL when a Foreign Data Wrapper (FDW) query references a column that the remote server does not supply. The planner halts and returns SQLSTATE HV007 before the query can run.<\/p>

This error means the local foreign table definition or SELECT list is out of sync with the actual column names on the remote table or view.

Fixing the mismatch lets the query succeed.<\/p>

What Causes This Error?<\/h3>

Column rename or drop operations on the remote database often trigger fdw_invalid_column_name because the local foreign table still lists the old column names.<\/p>

Manual SQL using an alias or typo that does not match any remote column will also raise HV007 during planning.

Case sensitivity mismatches in quoted identifiers are another frequent source.<\/p>

How to Fix fdw_invalid_column_name<\/h3>

First, confirm the remote table’s current schema with \d or DESCRIBE on the remote server. Compare each column to your local foreign table definition or SELECT list.<\/p>

Next, either recreate the foreign table with CREATE FOREIGN TABLE or refresh it with IMPORT FOREIGN SCHEMA.

Alternatively, edit the query to use the correct column names or aliases.<\/p>

Common Scenarios and Solutions<\/h3>

If only one column was renamed, use ALTER FOREIGN TABLE ... RENAME COLUMN to update the local mapping and avoid dropping dependent objects.<\/p>

When many columns changed, IMPORT FOREIGN SCHEMA ... LIMIT TO can regenerate the table quickly.

For pushdown queries, adjust the column list in OPTIONS (columns 'col1,col2') to match reality.<\/p>

Best Practices to Avoid This Error<\/h3>

Automate schema refreshes after remote migrations so the local FDW mappings stay current. Use version control to track foreign table definitions.<\/p>

In Galaxy, enable edit tracking on Collections so team members see approved column name changes and update dependent queries proactively.<\/p>

Related Errors and Solutions<\/h3>

fdw_invalid_option_name (HV00C) appears when an unknown FDW option is used.

Fix it by checking allowed OPTIONS for the FDW.<\/p>

fdw_invalid_data_type (HV005) happens when the remote column uses an unsupported type. Map it to a compatible PostgreSQL type or cast it in the SELECT list.<\/p>.