The fdw_invalid_option_index error signals that an FDW option reference is out of bounds or undefined, usually during CREATE/ALTER SERVER, FOREIGN TABLE, or USER MAPPING statements.
fdw_invalid_option_index occurs when PostgreSQL cannot find an FDW option at the specified index. The error is resolved by correcting or removing the invalid option in the OPTIONS list or by upgrading the faulty FDW extension.
PostgreSQL Error HV00C
PostgreSQL raises fdw_invalid_option_index when a foreign data wrapper tries to access an option number that does not exist. The SQLSTATE code is HV00C and belongs to the FDW error class.
The failure happens during CREATE SERVER, ALTER SERVER, CREATE FOREIGN TABLE, ALTER FOREIGN TABLE, or ALTER USER MAPPING. PostgreSQL calls the FDW validator function, which expects option indexes to be sequential and valid.
An out-of-range request triggers the exception.
The error stops the DDL statement and prevents the foreign server or table from being created or altered. Queries relying on that object fail, breaking data pipelines connected through FDW.
You see the exact message "ERROR: HV00C: fdw_invalid_option_index" in the psql console, application logs, or Galaxy SQL editor output.
No object is created or modified.
An FDW extension requests an option index that is larger than the number of options supplied. This is common when option names are misspelled or placed in the wrong clause.
Using an outdated or custom FDW that has a bug in its validator can also trigger the condition, even when SQL looks correct.
First, review the OPTIONS list in your CREATE or ALTER statement.
Make sure every option matches the FDW documentation and appears in the correct object scope.
If the SQL is correct, upgrade or patch the FDW extension. Many community FDWs have released fixes specifically for incorrect option index handling.
postgres_fdw: Including database-specific options such as "query" in a SERVER definition instead of a FOREIGN TABLE causes the error. Relocate or remove the option.
mysql_fdw: Older versions before 5.0 attempted to access option index 4 unconditionally.
Updating to 5.0 or later resolves the issue.
Validate OPTIONS against the FDW’s official docs before running DDL. Stick to stable versions of extensions and test upgrades in staging.
Use Galaxy’s AI linting feature to flag unsupported options in real time, preventing invalid statements from reaching the database.
fdw_invalid_string_length_or_buffer_length - Occurs when an FDW option value exceeds defined length.
Fix by shortening the value.
fdw_unable_to_create_execution - Signals failure when starting a foreign scan. Verify server connectivity and user mapping.
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The error is thrown by core PostgreSQL but is usually caused by a bug or misconfiguration in the FDW extension layer.
No. The DDL stops executing, meaning the foreign object is not created or updated. Ignoring the error leaves your setup incomplete.
Not necessarily. The root cause often resides in the FDW extension. Upgrade both PostgreSQL and the FDW to supported versions.
Galaxy’s context-aware AI suggests valid FDW options as you type, warns about misplaced clauses, and highlights deprecated options before execution.
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