Jan Ciolek a8cc5ed491 schema_altering_statement: return warnings from prepare_schema_mutations() ...

Validation of a CREATE MATERIALIZED VIEW statement takes place inside
the prepare_schema_mutations() method.
I would like to generate warnings during this validation, but there's
currently no way to pass them.

Let's add one more return value - a vector of CQL warnings generated
during the execution of this statement.

A new alias is added to make it clear what the function is returning:
```c++
// A vector of CQL warnings generated during execution of a statement.
using cql_warnings_vec = std::vector<sstring>;
```

Later the warnings will be sent to the user by the function
schema_altering_statment::execute(), which is the only caller
of prepare_schema_mutations().

Signed-off-by: Jan Ciolek <jan.ciolek@scylladb.com>

2023-06-07 02:30:07 +02:00

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