@Override
    public int getKeyIndex() {
        return 0;
    }
The RedisSchema for Bitmap data-type and StaticKvPair mode.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/redis/src/main/java/org/apache/inlong/sort/redis/common/schema/impl/BitmapStaticKvPairSchema.java