How to diagnose and fix the HV00J fdw_option_name_not_found error code in Postgres.

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The HV00J error code in PostgreSQL refers to fdw_option_name_not_found. This error occurs when a foreign data wrapper (FDW) option that is expected by the foreign server, user mapping, or foreign table does not exist. This could be due to a misspelling, omission in the definition, or use of an option that is not supported by the specific FDW.

To diagnose and fix the HV00J error, you need to review the options you have specified for your foreign data wrapper setup and compare them with the options supported by the FDW you are using. Here are some examples and sample code to address the issue:

Example 1: Creating a Foreign Server with Missing Options

When creating a foreign server, you might forget to include a required option or misspell an option name.

Diagnosis:
Check the documentation of the FDW to find the required options for creating a foreign server.

Fix:
Add the missing option or correct the spelling of the option name.

-- Incorrect creation of foreign server with a misspelled option
CREATE SERVER foreign_server
FOREIGN DATA WRAPPER my_fdw
OPTIONS (host 'example.com', prt '5432');

-- Corrected foreign server creation with the right option name
CREATE SERVER foreign_server
FOREIGN DATA WRAPPER my_fdw
OPTIONS (host 'example.com', port '5432'); -- 'port' instead of 'prt'

Example 2: User Mapping with Unsupported Options

When defining user mappings for an FDW, providing an option that is not recognized by the FDW will cause an HV00J error.

Diagnosis:
Review the FDW documentation to identify valid options for user mappings.

Fix:
Remove the unsupported option or replace it with a valid one.

-- Attempting to create a user mapping with an invalid option
CREATE USER MAPPING FOR CURRENT_USER
SERVER foreign_server
OPTIONS (username 'user', pass 'secret'); -- 'pass' might be incorrect

-- Correct user mapping with the supported option
CREATE USER MAPPING FOR CURRENT_USER
SERVER foreign_server
OPTIONS (username 'user', password 'secret'); -- 'password' instead of 'pass'

Example 3: Foreign Table with Incorrect Options

Defining a foreign table requires specifying options that match the capabilities of the FDW.

Diagnosis:
Verify each option in the foreign table definition against the supported options of the FDW.

Fix:
Correct any misspelled option names or add any missing required options.

-- Defining a foreign table with a wrong option
CREATE FOREIGN TABLE foreign_table (
    id integer,
    data text
) SERVER foreign_server
OPTIONS (delimeter ','); -- 'delimeter' could be misspelled

-- Correct definition with the right option name
CREATE FOREIGN TABLE foreign_table (
    id integer,
    data text
) SERVER foreign_server
OPTIONS (delimiter ','); -- 'delimiter' is the correct spelling

When you encounter the HV00J error, it is important to carefully review all the options you have specified for your FDW configuration. Ensure that each option name is spelled correctly and is supported by the FDW you are using. If necessary, refer to the FDW’s official documentation or the PostgreSQL documentation for FDW-related error codes to understand the required options and their correct usage.

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