fix(bigquery): sanitize unicode null sequence (#382)

* fix(bigquery): sanitize unicode sequence

* chore: add makefile lint target

Author: bsushmith

Makefile

@@ -35,4 +35,7 @@ generate-proto: ## regenerate protos
 	@echo " > cloning protobuf from odpf/proton"
 	@echo " > generating protobuf"
 	@buf generate --template buf.gen.yaml https://github.com/odpf/proton/archive/a0bc6dbf2ad91abfebc4bf5f70e275983109baca.zip#strip_components=1 --path odpf/assets
-	@echo " > protobuf compilation finished"
+	@echo " > protobuf compilation finished"
+
+lint: ## Lint with golangci-lint
+	golangci-lint run

plugins/extractors/bigquery/bigquery.go

@@ -312,6 +312,10 @@ func (e *Extractor) buildPreview(ctx context.Context, t *bigquery.Table) (previe
 			err = errors.Wrapf(err, "error marshalling \"%s\" to json", t.FullyQualifiedName())
 			return
 		}
+		// sanitize unicode sequence
+		// replace unicode null characters with "null" string to ensure downstream would not have issues dealing with unicode null characters
+		jsonString := strings.ReplaceAll(string(jsonBytes), "\\u0000", "null")
+		jsonBytes = []byte(jsonString)
 		err = json.Unmarshal(jsonBytes, &temp)
 		if err != nil {
 			err = errors.Wrapf(err, "error marshalling \"%s\" to json", t.FullyQualifiedName())