dabla opened a new pull request, #40836:
URL: https://github.com/apache/airflow/pull/40836
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This PR adds support for the replace option when using insert_rows with the
MsSqlHook. Unfortunately MSSQL doesn't have a REPLACE or an UPSERT SQL syntax.
In order to achieve the same functionality, you have to use the MERGE INTO
statement. In order to be able to use that statement in a dynamic way, you
have to get the primary keys of the table you want to replace into. This means
the current implementation of the _generate_insert_sql with the
_replace_statement_format field won't work, as some assumptions have been made
there which makes it impossible to achieve the same with the current
_generate_insert_sql implementation of the DbApiHook.
So to make it work for MsSqlHook, I've override the _generate_insert_sql
method in the MsSqlHook and also added a method named get_primary_keys which
dynamically retrieves the PK associated to the given table as this will be
needed for the MERGE INTO SQL statement. If the _generate_insert_sql method is
called for insert statement, then the original implementation is being called,
otherwise the MSSQL specific implementation is being executed.
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