执行查询时
Exception in thread "main" java.lang.NullPointerException
at scala.collection.mutable.ArrayOps$ofInt$.length$extension(ArrayOps.scala:240)
at scala.collection.mutable.ArrayOps$ofInt.length(ArrayOps.scala:240)
at scala.collection.SeqLike$class.size(SeqLike.scala:106)
at scala.collection.mutable.ArrayOps$ofInt.size(ArrayOps.scala:234)
at scala.collection.mutable.Builder$class.sizeHint(Builder.scala:69)
at scala.collection.mutable.ArrayBuilder.sizeHint(ArrayBuilder.scala:22)
at scala.collection.TraversableLike$class.builder$1(TraversableLike.scala:230)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:233)
at scala.collection.mutable.ArrayOps$ofInt.map(ArrayOps.scala:234)
at org.apache.flink.table.planner.codegen.agg.DeclarativeAggCodeGen.<init>(DeclarativeAggCodeGen.scala:81)
at org.apache.flink.table.planner.codegen.agg.AggsHandlerCodeGenerator$$anonfun$3.apply(AggsHandlerCodeGenerator.scala:220)
at org.apache.flink.table.planner.codegen.agg.AggsHandlerCodeGenerator$$anonfun$3.apply(AggsHandlerCodeGenerator.scala:212)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:186)
at org.apache.flink.table.planner.codegen.agg.AggsHandlerCodeGenerator.initialAggregateInformation(AggsHandlerCodeGenerator.scala:212)
at org.apache.flink.table.planner.codegen.agg.AggsHandlerCodeGenerator.generateAggsHandler(AggsHandlerCodeGenerator.scala:322)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecOverAggregate.createUnboundedOverProcessFunction(StreamExecOverAggregate.scala:344)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecOverAggregate.translateToPlanInternal(StreamExecOverAggregate.scala:231)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecOverAggregate.translateToPlanInternal(StreamExecOverAggregate.scala:56)
at org.apache.flink.table.planner.plan.nodes.exec.ExecNode$class.translateToPlan(ExecNode.scala:58)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecOverAggregate.translateToPlan(StreamExecOverAggregate.scala:56)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecCalc.translateToPlanInternal(StreamExecCalc.scala:54)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecCalc.translateToPlanInternal(StreamExecCalc.scala:39)
at org.apache.flink.table.planner.plan.nodes.exec.ExecNode$class.translateToPlan(ExecNode.scala:58)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecCalcBase.translateToPlan(StreamExecCalcBase.scala:38)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecSink.translateToTransformation(StreamExecSink.scala:184)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecSink.translateToPlanInternal(StreamExecSink.scala:153)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecSink.translateToPlanInternal(StreamExecSink.scala:48)
at org.apache.flink.table.planner.plan.nodes.exec.ExecNode$class.translateToPlan(ExecNode.scala:58)
at org.apache.flink.table.planner.plan.nodes.physical.stream.StreamExecSink.translateToPlan(StreamExecSink.scala:48)
at org.apache.flink.table.planner.delegation.StreamPlanner$$anonfun$translateToPlan$1.apply(StreamPlanner.scala:60)
at org.apache.flink.table.planner.delegation.StreamPlanner$$anonfun$translateToPlan$1.apply(StreamPlanner.scala:59)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.Iterator$class.foreach(Iterator.scala:891)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at org.apache.flink.table.planner.delegation.StreamPlanner.translateToPlan(StreamPlanner.scala:59)
at org.apache.flink.table.planner.delegation.PlannerBase.translate(PlannerBase.scala:153)
at org.apache.flink.table.api.java.internal.StreamTableEnvironmentImpl.toDataStream(StreamTableEnvironmentImpl.java:351)
at org.apache.flink.table.api.java.internal.StreamTableEnvironmentImpl.toAppendStream(StreamTableEnvironmentImpl.java:259)
我明白了
package com.example
import org.apache.flink.streaming.api.TimeCharacteristic
import org.apache.flink.table.api.EnvironmentSettings
object Application extends App {
import org.apache.flink.streaming.api.scala._
import org.apache.flink.table.api.scala._
val env = StreamExecutionEnvironment.getExecutionEnvironment
env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime)
val config = EnvironmentSettings.newInstance().inStreamingMode().useBlinkPlanner().build()
val tEnv = StreamTableEnvironment.create(env, config)
val input = env.fromElements(
Model("k", "v", 1L)
)
tEnv.createTemporaryView("InputTable", input, 'k, 'v, 'ts.rowtime)
val output = tEnv.sqlQuery(
"SELECT k, v, ROW_NUMBER() OVER (PARTITION BY k ORDER BY ts) AS rn FROM InputTable a"
)
tEnv.toRetractStream[Model](output).print()
env.execute()
}
final case class Model(k: String, v: String, ts: Long)
我正在使用带有眨眼计划程序的Flink 1.10。
示例：
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