[data-protocols] Thoughts on JSON Table Schema

[Paul Walsh]

Hi,

For the quick question: a JSON Schema of JSON Table Schema is here: https://github.com/dataprotocols/schemas/blob/master/json-table-schema.json <https://github.com/dataprotocols/schemas/blob/master/json-table-schema.json>

Best,

Paul

> On 6 Jul 2015, at 20:35, Alex Dean <alex at snowplowanalytics.com> wrote:
> 
> Hi,
> 
> First can I say I am a long-time follower and huge fan of the dataprotocols.org <http://dataprotocols.org/> project.
> 
> At Snowplow we are thinking of using JSON Table Schema in our Iglu schema repository system:
> 
> https://github.com/snowplow/iglu <https://github.com/snowplow/iglu>
> 
> First a quick question - I couldn't find a JSON Schema for the JSON Table Schema. Has anybody written this yet?
> 
> More broadly: I'm not convinced that the current unitary JSON Table Schema is a viable approach.
> 
> Different relational databases have different capabilities - for example, a valid table definition for Redshift must have SORTKEY and DISTKEY, and indexes are not supported. This is distinct from Postgres DDL, which in turn is distinct from BigQuery DDL, Vertica DDL etc.
> 
> For me, the value of a JSON Table Schema would be in making table DDL declarative and composable. To be useful though, it must be possible to generate valid idiomatic (i.e. database-specific) DDL from a given instance of a JSON Table Schema.
> 
> Based on this, I'm leaning towards a JSON Table Schema which has database-specific flavors. I think the two options here are:
> Create a separate definition document (in JSON Schema) for each database that we want to support, or
> Create a unitary JSON Table Schema which uses enums of e.g. database-specific field-descriptor types to support differences
> The downside of the first option is that there is no guaranteed predictability of schema shape between different database types. The second option is a little more fiddly but probably more useful long-term.
> 
> Does anybody have any thoughts on the above?
> 
> Thanks,
> 
> Alex
> 
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