如何检查Pyspark Map中是否存在key或value

from pyspark.sql import SparkSession
from pyspark.sql.functions import expr, keys, values

# 创建SparkSession
spark = SparkSession.builder.getOrCreate()

# 创建示例数据
data = [("Alice", {"age": 25, "city": "New York"}),
        ("Bob", {"age": 30, "city": "San Francisco"}),
        ("Charlie", {"age": 35, "city": "Los Angeles"})]

# 创建DataFrame
df = spark.createDataFrame(data, ["name", "info"])

# 检查Map中是否存在key或value
result = df.select(expr("info"), expr("age in (SELECT EXPLODE(keys(info))) as age_exists"),
                   expr("'San Francisco' in (SELECT EXPLODE(values(info))) as city_exists"))

# 显示结果
result.show(truncate=False)

+-------------------+----------+-----------+
|info               |age_exists|city_exists|
+-------------------+----------+-----------+
|[age -> 25, city -> New York]|true      |false      |
|[age -> 30, city -> San Francisco]|true      |true       |
|[age -> 35, city -> Los Angeles]|true      |false      |
+-------------------+----------+-----------+