risingwave_frontend::handler::create_source

Enum SqlColumnStrategy

source 
pub enum SqlColumnStrategy {
    FollowUnchecked,
    FollowChecked,
    Ignore,
}
Expand description

When the schema can be inferred from external system (like schema registry), how to handle the regular columns (i.e., non-generated) defined in SQL?

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FollowUnchecked

Follow all columns defined in SQL, ignore the columns from external system. This ensures that no accidental side effect will change the schema.

This is the behavior when re-planning the target table of SINK INTO.

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FollowChecked

Follow all column defined in SQL, check the columns from external system with name & type. This ensures that no accidental side effect will change the schema.

This is the behavior when creating a new table or source with a resolvable schema; adding, or dropping columns on that table.

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Ignore

Merge the generated columns defined in SQL and columns from external system. If there are also regular columns defined in SQL, ignore silently.

This is the behavior when REFRESH SCHEMA atop the purified SQL.

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