StructField Metadata Dictionary - What are the possible keys?

chaosBEE
New Contributor II

‎06-20-2024 05:40 AM

I have a Delta Live Table which is being deposited to Unity Catalog. In the Python notebook, I am defining the schema with a series of StructFields, for example:
 
StructField(
    "columnName",
    StringType(),
    True,
    metadata = {
        'comment': "This is a comment"
    }
)
 
This works, however now I am trying to add tags, I have tried the following, but it doesn't seem to work:
 
metadata = {
        'comment': "This is a comment"
        'tags': {
            'tag1': 'x',
            'tag2': 'y',
        }
    }
 
Does anyone know to add tags to columns programmatically using the Python API?
 
Also, does anyone know how to add tags to the specific table, I am using 
dlt.create_streaming_table(), but there doesn't seem to be an option here: Delta Live Tables Python language reference | Databricks on AWS
 
Any help would be greatly appreciated!
 
Thanks,
Riqo