Pick connection option

[martindurant]

pysolr is actually a very thin wrapper passing query parameters to requests. We could easily implement this ourselves, or use another wrapper such as SolrClient - which, for example, has paging results support and schema field listing, but we don't actually need any of that if all we want to do is execute the REST endpoint.

[martindurant]

e.g., to get CSV output, you need merely add &wt=csv tot he query and this will be far more performant on the client end.

[martindurant]

Note that there is a difference in SOLR-land between collections with or without schemas. That could be used to define whether the tabular or sequential data source if preferred. If there is a schema, it seems you can get the field types without pulling any data https://lucene.apache.org/solr/guide/6_6/schema-api.html#SchemaAPI-ListFields .