@copilot You missed some providers.

DB2 supports it via "IMPLICITLY HIDDEN" syntax; See https://www.ibm.com/docs/en/db2/12.1.x?topic=concepts-hidden-columns

Example 1: In the following statement, a table is created with an implicitly hidden column.

     CREATE TABLE CUSTOMER
     (
       CUSTOMERNO       INTEGER NOT NULL,
       CUSTOMERNAME     VARCHAR(80),
       PHONENO          CHAR(8) IMPLICITLY HIDDEN
     );

@copilot You missed some providers.

DB2 supports it via "IMPLICITLY HIDDEN" syntax; See https://www.ibm.com/docs/en/db2/12.1.x?topic=concepts-hidden-columns
...

Added DB2 support with IMPLICITLY HIDDEN syntax to the ADR. Updated the support matrix, generator implementation examples, version-specific support section, ALTER COLUMN considerations, and constraints/limitations to include DB2 v9.7+. (b665377)

@copilot
I think we should replace the "Syntax" column in your grid with a "CREATE TABLE syntax" column and an "ALTER TABLE ADD COLUMN syntax" column and an "ALTER TABLE ALTER COLUMN syntax" column. The existing DB2 example is "CREATE TABLE syntax".

1. The "ALTER TABLE ADD COLUMN" syntax for DB2 is here: https://www.ibm.com/docs/en/db2/12.1.x?topic=statements-alter-table#sdx-synid_column-options
2. The "ALTER TABLE ALTER COLUMN" syntax for DB2 is: ALTER TABLE <table-name> ALTER COLUMN <column-name> SET {NOT HIDDEN | IMPLICITLY HIDDEN}

@copilot
I think we should replace the "Syntax" column in your grid with a "CREATE TABLE syntax" column and an "ALTER TABLE ADD COLUMN syntax" column and an "ALTER TABLE ALTER COLUMN syntax" column....

Restructured the table with separate columns for CREATE TABLE, ALTER TABLE ADD COLUMN, and ALTER TABLE ALTER COLUMN syntax. Updated DB2 to include both IMPLICITLY HIDDEN and NOT HIDDEN keywords, with proper ALTER COLUMN syntax (SET IMPLICITLY HIDDEN / SET NOT HIDDEN). Added DB2 ALTER TABLE Statement reference link. (91d9c74)

@PhenX Think this looks great. Thoughts? I agree with copilot's default recommendation

Yep looks good!

I think my new approach is going to be to model feature enhancements this way. First have Copilot explain its thinking, then create a separate issue for it to go implement it.