The following documentation comment has been logged on the website: Page: https://www.postgresql.org/docs/15/sql-comment.html Description:
I've recently been converting some DML which was intended for BigQuery to use PostgreSQL 14. Using a python client (using sqlalchemy and the postgresql+psycopg2 driver), I had successfully created a table and was trying to add comments to the columns. All of this was previously done in a single statement on BigQuery, but requires separate CREATE TABLE and COMMENT ON COLUMN statements for PostgreSQL. For one of the comment statements I received this error: "dict is not a sequence". It turns out the culprit was that one of the comments had a '%' character. I'm not familiar with restrictions on strings in PostgreSQL, but it would be helpful to have a list of these.
