potiuk commented on issue #21457:
URL: https://github.com/apache/airflow/issues/21457#issuecomment-1035176685
> ```python
> psycopg2.errors.UniqueViolation: duplicate key value violates unique
constraint "Employees_temp_pkey"
> DETAIL: Key ("Serial Number")=(2) already exists.
> CONTEXT: COPY Employees_temp, line 2
> ```
This error indicates that the input file contain a duplicate (or maybe
Postgres has case-sensitive names and the DROP did not actually drop the
table)?
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