Unexpected field matching when using chinese

Redis modules RediSearch
1

schema

TagField("$.id", as_name="id"), 
TextField("$.brand", as_name="brand"), 
TextField("$.title", as_name="title"), 
TextField("$.category", as_name="category"), 
TextField("$.param", as_name="param"), 
TextField("$.tags", as_name="tags"), 
NumericField("$.price", as_name="price"), 
NumericField("$.comments.positive_ratio", as_name="positive_ratio"),

query

FT.SEARCH sku:idx "@category:耳机 AND @brand:(华为) AND @price:[1500 2000]" LANGUAGE chinese

query explain

Explain with language chinese

FT.EXPLAIN sku:idx "@category:耳机 AND @brand:(华为) AND @price:[1500 2000]" LANGUAGE chinese

INTERSECT {
  UNION {
    @category:耳机
    INTERSECT {
      耳机(expanded)
    }
  }
  UNION {
    @brand:华为
    INTERSECT {
      华为(expanded)
    }
  }
  NUMERIC {1500.000000 <= @price <= 2000.000000}
}

Explain without chinese

FT.EXPLAIN sku:idx "@category:耳机 AND @brand:(华为) AND @price:[1500 2000]"

INTERSECT {
  @category:UNION {
    @category:耳机
    @category:+耳机(expanded)
  }
  @brand:UNION {
    @brand:华为
    @brand:+华为(expanded)
  }
  NUMERIC {1500.000000 <= @price <= 2000.000000}
}

result:

One return doc of the result is as below:

{"id":"100052917480","brand":"Technics","expanded_brand":"Technics","title":"Technics尊享级 真无线入耳蓝牙立体声耳机 运动跑步耳机 适用于苹果华为小米手机 AZ80黑色","category":"数码>影音娱乐>蓝牙/无线耳机","param":"商品名称:TechnicsEAH-AZ80; 商品编号:100052917480; 商品毛重:0.6kg; 商品产地:马来西亚; 特色功能:主动降噪; 类别:降噪耳机; 音频传输协议:SBC，AAC，LDAC; 佩戴方式:入耳式; 连接方式:蓝牙","price":1999.0,"comments":{"total":100,"positive":10,"positive_ratio":0.94,"neutral":1,"neutral_ratio":0.06,"negative":0,"negative_ratio":0.0,"real_total":11,"real_positive_ratio":0.91}}

unexpected reason

The return result is a product with brand Technics not 华为, but the title contains 华为

tried methods

  • add Dialect 1-3, not working
  • exact match with quotes, working for this case, but not general for all cases, e.g. category=蓝牙/无线耳机, search query @category:蓝牙耳机 will return nothing