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In the code we execute two identical queries. One of them has a comment at the beginning.
Despite passing the type of the query, sequelize changes the type automatically based on the contents of the query:
https://github.com/sequelize/sequelize/blob/d047f3275a451df73294f222c8a2c99ffdd22299/src/dialects/abstract/query.js#L203-L204
This causes the query type to be different depending on if there is a comment at the beginning.
As a result, the return value is different.
Note that if the SQL starts with "insert into" it is considered to be an insert statement according to the code linked above.
However, this may not be true in case of an UPSERT in postgresql as that can do one of
{insert, update, nothing}
even if the statement starts with an "insert into".Output: