当我尝试读取包含JSON字符串作为数组的spark数据框列时，使用已定义的架构，它将返回null。我尝试使用Array，Seq和List作为模式，但是所有返回的都是null。我的Spark版本是2.2.0
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和输出
val dfdata= spark.sql("""select "\[{ \"id\":\"93993\", \"name\":\"Phil\" }, { \"id\":\"838\", \"name\":\"Don\" }]" as theJson""")
dfdata.show(5,false)
val sch = StructType(
Array(StructField("id", StringType, true),
StructField("name", StringType, true)))
print(sch.prettyJson )
dfdata.select(from_json($"theJson", sch)).show
答案 0 :(得分：1)
您的模式不适合您的示例。您的示例是一个结构数组。尝试将其包装在ArrayType中：
val sch = ArrayType(StructType(Array(
StructField("id", StringType, true),
StructField("name", StringType, true)
)))
答案 1 :(得分：0)
您是否曾尝试在获取DF之前解析json字符串？
// obtaining this string should be easy:
val jsonStr = """[{ "id":"93993", "name":"Phil" }, { "id":"838", "name":"Don" }]"""
// then you can take advantage of schema inference
val df2 = spark.read.json(Seq(jsonStr).toDS)
df2.show(false)
// it shows:
// +-----+----+
// |id |name|
// +-----+----+
// |93993|Phil|
// |838 |Don |
// +-----+----+