When i try to use this below code getting this error :*Exception in thread
"main" org.apache.spark.sql.AnalysisException: Generators are not supported
when it's nested in expressions, but got:
generatorouter(explode(generatorouter(explode(json))));*StructType schema =
DataTypes.createStructType( new StructField[] {
DataTypes.createStructField("AckedState", DataTypes.StringType, true),
DataTypes.createStructField("ConfirmedState", DataTypes.StringType, true),
DataTypes.createStructField("Time", DataTypes.DoubleType, true),
DataTypes.createStructField("ActiveState", DataTypes.StringType, true),
DataTypes.createStructField("SourceNode", DataTypes.StringType, true),
DataTypes.createStructField("SourceName", DataTypes.StringType, true),
DataTypes.createStructField("Message", DataTypes.StringType, true),
DataTypes.createStructField("Severity", DataTypes.IntegerType, true) });
Dataset df =
sparkSession.readStream().format("kafka").option("kafka.bootstrap.servers",
brokers) .option("kafka.ssl.keystore.location",
keystore).option("kafka.security.protocol", "SASL_SSL")
.option("kafka.ssl.keystore.password",
"abc").option("kafka.ssl.truststore.location", truststore)
.option("kafka.ssl.truststore.password",
"abc").option("kafka.sasl.jaas.config", jaasCfg)
.option("kafka.sasl.mechanism", "PLAIN").option("group.id", consumerGroupId)
.option("value.serializer", serializer).option("key.serializer", serializer)
.option("session.timeout.ms", "30000").option("subscribe", "alerts5").load()
.selectExpr("CAST(value AS STRING) as json"); df.printSchema();
Column col
= new Column("json"); Dataset data =
df.select(functions.from_json(col,
schema).as("json")); data.printSchema();
Dataset results =
data.select(functions.explode_outer(functions.explode_outer(new
Column("json")))); results.printSchema();
results.show();
results.writeStream().format("console").option("truncate",
false).start().awaitTermination();i am using function.from_json
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