hover.schema.IMPORT.md Maven / Gradle / Ivy

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## import field


Contained in [schema](https://docs.vespa.ai/en/reference/schema-reference.html#schema).
Using a [reference](https://docs.vespa.ai/en/reference/schema-reference.html#reference) to a document type,
import a field from that document type into this schema to be used for matching, ranking, grouping and sorting.
Only attribute fields can be imported.
Importing fields are not supported in
[streaming search](https://docs.vespa.ai/en/streaming-search.html#differences-in-streaming-search).


The imported field inherits all but the following properties from the parent field:


    [attribute: fast-access](https://docs.vespa.ai/en/reference/schema-reference.html#attribute)


Refer to [parent/child](https://docs.vespa.ai/en/parent-child.html) for a complete example.
Note that the imported field is put outside of the document type:

```
schema myschema {
    document myschema {
        field parentschema_ref type reference {
            indexing: attribute
        }
    }
    import field parentschema_ref.name as parent_name {}
}
``` 


Extra restrictions apply for some of the field types:

[Read more](https://docs.vespa.ai/en/reference/schema-reference.html#import-field)