Span.Warnings not stored in Cassandra

[vprithvi]

The model Span.Warnings field isn't stored in Cassandra.

jaeger/model/span.go

Line 59 in fcbd210

Warnings []string `json:"warnings,omitempty"`

Cassandra schema for reference:

jaeger/plugin/storage/cassandra/schema/v001.cql.tmpl

Lines 54 to 68 in ec6378a

	CREATE TABLE IF NOT EXISTS ${keyspace}.traces (
	trace_id blob,
	span_id bigint,
	span_hash bigint,
	parent_id bigint,
	operation_name text,
	flags int,
	start_time bigint,
	duration bigint,
	tags list<frozen<keyvalue>>,
	logs list<frozen<log>>,
	refs list<frozen<span_ref>>,
	process frozen<process>,
	PRIMARY KEY (trace_id, span_id, span_hash)
	)

The warnings field contains details on any conversion failures from thrift to the internal model object. I feel that this is important information that should be persisted along with the rest of the Span.

[vprithvi]

@ys Any opinions against doing this?

[yurishkuro]

+1

[pts95]

I'm taking this issue up, if no one else is taking this. 🙏