src/main/java/com/conveyal/gtfs/graphql/fetchers/RowCountFetcher.java
public static GraphQLFieldDefinition field (String fieldName, String tableName) {
        return newFieldDefinition()
                .name(fieldName)
                .type(GraphQLInt)
                .dataFetcher(new RowCountFetcher(tableName))
                .build();
    }
public static GraphQLFieldDefinition field (String fieldName, String tableName) {
        return newFieldDefinition()
                .name(fieldName)
                .type(GraphQLInt)
                .dataFetcher(new RowCountFetcher(tableName))
                .build();
    }
Convenience method to create a field in a GraphQL schema that fetches the number of rows in a table.
Must be on a type that has a "namespace" field for context.