Hello,

I've looked into adding lat/long support for Ways. I know that osmium can add location on ways and that some other tools can read it. This would allow you to create the WKT of the way without too much headache.

I've added the lat/lon, the same as the osmformat.proto

message Way {
   required int64 id = 1;
   // Parallel arrays.
   repeated uint32 keys = 2 [packed = true];
   repeated uint32 vals = 3 [packed = true];

   optional Info info = 4;

   repeated sint64 refs = 8 [packed = true];  // DELTA coded

+  repeated sint64 lat = 9 [packed = true]; // DELTA coded, optional
+  repeated sint64 lon = 10 [packed = true]; // DELTA coded, optional
}

In the OsmSqlEtity I've added a new schema for way.nodes

  lazy val wayNodeSchema = StructType(
    Seq(
      StructField(FIELD_ID, LongType, true),
      StructField(FIELD_LATITUDE, DoubleType, true),
      StructField(FIELD_LONGITUDE, DoubleType, true)
    ))

Before I make a PR I wanted to know your opinion if this would be acceptable.

Thanks in advance