normalized table filters

[bassrock]

Is your feature request related to a problem? Please describe.

Right now it is not possible to filter on anything other then event_name in the normalize_config.

Given the following

 "events":[
        {
            "event_names": ["object_update"],
            "event_columns": ["derived_tstamp"],
            "self_describing_event_schemas": [
                "iglu:com.acme/object_update/jsonschema/1-0-20"
            ],
            "self_describing_event_aliases": ["object_update"],
            "table_name": "snowplow_acme_object_updates",
            "context_schemas":[
                "iglu:com.acme/some_object/jsonschema/1-0-3"
            ],
            "filter":
            "context_aliases": ["some_object"]
        }
    ]

I always have to add something like this in the generated model, to do a filter statement.

{{ snowplow_normalize.normalize_events(
    event_names,
    flat_cols,
    sde_cols,
    sde_keys,
    sde_types,
    sde_aliases,
    context_cols,
    context_keys,
    context_types,
    context_alias
) }} 

-- The following is a custom change, the rest is generated. Always ensure this is re-added.
and object_update_object_type = 'a_custom_object'

Describe the solution you'd like

 "events":[
        {
            "event_names": ["object_update"],
            "event_columns": ["derived_tstamp"],
            "self_describing_event_schemas": [
                "iglu:com.acme/object_update/jsonschema/1-0-20"
            ],
           "self_describing_event_schemas_filters": [
                   {"object": "a_custom_object"}
            ],
            "self_describing_event_aliases": ["object_update"],
            "table_name": "snowplow_acme_object_updates",
            "context_schemas":[
                "iglu:com.acme/some_object/jsonschema/1-0-3"
            ],
            "filter":
            "context_aliases": ["some_object"]
        }
    ]

Are you interested in contributing towards this feature?

Happy to help contribute if pointed in the right directions.