code: private Path getOrGenerateSchemaFile(Schema schema) throws IOException {
  
      Preconditions.checkNotNull(schema, "Avro Schema should not be null");
  
      String hashedSchema = Hashing.sha256().hashString(schema.toString(), StandardCharsets.UTF_8).toString();
  
      if (!this.schemaPaths.containsKey(hashedSchema)) {
  
        Path schemaFilePath = new Path(this.schemaDir, String.valueOf(System.currentTimeMillis() + ".avsc"));
        AvroUtils.writeSchemaToFile(schema, schemaFilePath, fs, true);
  
        this.schemaPaths.put(hashedSchema, schemaFilePath);
      }
  
      return this.schemaPaths.get(hashedSchema);
    }
docs: If url for schema already exists, return the url. If not create a new temporary schema file and return a the url.