Added enumsasints plugin parameter

[chuhlomin]

This PR is introducing enumsasints plugin parameter to change the behavior of the plugin and use Integers instead of Strings in BigQuery schema to express Protobuf Enums values.

Potentially solves #3

Example usage:

protoc --bq-schema_out=enumsasints=true:bq_schema foo.proto

Implemented and tested in https://github.com/chuhlomin/protoc-gen-bq-schema:

• foo.proto
• protoc call
• bar_table.schema

[jeremiepiotte-districtm]

Can this PR be merged? It would be of great help without modifying the source code too much.

Thank you

[chuhlomin]

@jeremiepiotte-districtm, this repository doesn't seem actively maintained, check this out:

• https://github.com/chuhlomin/protoc-gen-bq-schema
• https://hub.docker.com/repository/docker/chuhlomin/protoc-gen-bq-schema

[ashutosh25apr]

Facing issue with generated schema for map , which the bigquery considers as a repeated record with field names as key and value ,but json generated from proto pojo doesn't contain key and value in it

[chuhlomin]

Facing issue with generated schema for map

Hey, I cannot reproduce that issue, could you provide some examples?

Here is what I tried: foo.proto

map<string, string> someMap = 9;

bar_table.schema:

 {
  "name": "someMap",
  "type": "RECORD",
  "mode": "REPEATED",
  "fields": [
   {
    "name": "key",
    "type": "STRING",
    "mode": "NULLABLE"
   },
   {
    "name": "value",
    "type": "STRING",
    "mode": "NULLABLE"
   }
  ]
 },

[judahrand]

@mescanne Is this an approach you'd be happy with or would you prefer a field by field option in the Protobuf definitions?

[mescanne]

@mescanne Is this an approach you'd be happy with or would you prefer a field by field option in the Protobuf definitions?

As long as it's backwards compatible (ie behind a flag) and is a step forward in terms of improvement I'm happy.

I'd also like to have a test case for it -- the CI re-generates the examples and ensure they match up with what's in git, so we can run the re-generation twice (once with the flag, once without) into two separate outputs and ensure things match up.