wuchong commented on a change in pull request #8203:
[Flink-12208][table-planner-blink] Support translation from StreamExecSort /
TemporalSort / SortLimit/ Limit to StreamTransformation.
URL: https://github.com/apache/flink/pull/8203#discussion_r277502987
##########
File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/plan/nodes/physical/stream/StreamExecSortLimit.scala
##########
@@ -97,5 +114,113 @@ class StreamExecSortLimit(
}
}
- // TODO check `fetch` is not null in translateToPlan
+ //~ ExecNode methods
-----------------------------------------------------------
+
+ override def getInputNodes: util.List[ExecNode[StreamTableEnvironment, _]] =
{
+ List(getInput.asInstanceOf[ExecNode[StreamTableEnvironment, _]])
+ }
+
+ override protected def translateToPlanInternal(
+ tableEnv: StreamTableEnvironment): StreamTransformation[BaseRow] = {
+ if (fetch == null) {
+ throw new TableException(
+ "FETCH is missed, which on streaming table is not supported currently")
+ }
+
+ val inputTransform = getInputNodes.get(0).translateToPlan(tableEnv)
+ .asInstanceOf[StreamTransformation[BaseRow]]
+ val inputRowTypeInfo =
inputTransform.getOutputType.asInstanceOf[BaseRowTypeInfo]
+ val fieldCollations = sortCollation.getFieldCollations
+ val (sortFields, sortDirections, nullsIsLast) =
SortUtil.getKeysAndOrders(fieldCollations)
+ val sortKeySelector = KeySelectorUtil.getBaseRowSelector(sortFields,
inputRowTypeInfo)
+ val sortKeyType = sortKeySelector.getProducedType
+ val tableConfig = tableEnv.getConfig
+ val sortKeyComparator = ComparatorCodeGenerator.gen(
+ tableConfig,
+ "StreamExecSortComparator",
+ sortFields.indices.toArray,
+ sortKeyType.getInternalTypes,
+ sortDirections,
+ nullsIsLast)
+ val generateRetraction = StreamExecRetractionRules.isAccRetract(this)
+ val cacheSize =
tableConfig.getConf.getLong(TableConfigOptions.SQL_EXEC_TOPN_CACHE_SIZE)
+ val minIdleStateRetentionTime = tableConfig.getMinIdleStateRetentionTime
+ val maxIdleStateRetentionTime = tableConfig.getMaxIdleStateRetentionTime
+
+ // rankStart begin with 1
+ val rankRange = new ConstantRankRange(limitStart + 1, limitEnd)
+ val rankType = RankType.ROW_NUMBER
+ val outputRankNumber = false
+
+ // Use RankFunction underlying StreamExecSortLimit
+ val processFunction = getStrategy(true) match {
+ case AppendFastStrategy =>
+ new AppendOnlyTopNFunction(
+ minIdleStateRetentionTime,
+ maxIdleStateRetentionTime,
+ inputRowTypeInfo,
+ sortKeyComparator,
+ sortKeySelector,
+ rankType,
+ rankRange,
+ generateRetraction,
+ outputRankNumber,
+ cacheSize)
+
+ case UpdateFastStrategy(primaryKeys) =>
+ val rowKeySelector = KeySelectorUtil.getBaseRowSelector(primaryKeys,
inputRowTypeInfo)
+ new UpdatableTopNFunction(
+ minIdleStateRetentionTime,
+ maxIdleStateRetentionTime,
+ inputRowTypeInfo,
+ rowKeySelector,
+ sortKeyComparator,
+ sortKeySelector,
+ rankType,
+ rankRange,
+ generateRetraction,
+ outputRankNumber,
+ cacheSize)
+
+ // TODO Use UnaryUpdateTopNFunction after SortedMapState is merged
+ case RetractStrategy | UnaryUpdateStrategy(_) =>
+ val equaliserCodeGen = new
EqualiserCodeGenerator(inputRowTypeInfo.getInternalTypes)
+ val generatedEqualiser =
equaliserCodeGen.generateRecordEqualiser("RankValueEqualiser")
+ new RetractableTopNFunction(
+ minIdleStateRetentionTime,
+ maxIdleStateRetentionTime,
+ inputRowTypeInfo,
+ sortKeyComparator,
+ sortKeySelector,
+ rankType,
+ rankRange,
+ generatedEqualiser,
+ generateRetraction,
+ outputRankNumber)
+ }
+ val operator = new KeyedProcessOperator(processFunction)
+ processFunction.setKeyContext(operator)
+
+ val outputRowTypeInfo =
FlinkTypeFactory.toInternalRowType(getRowType).toTypeInfo
+
+ // sets parallelism to 1 since StreamExecSortLimit could only work in
global mode.
+ val ret = new OneInputTransformation(
+ inputTransform,
+ getOperatorName,
+ operator,
+ outputRowTypeInfo,
+ 1)
Review comment:
Force maxParallelism to `1` too?
`ret.setMaxParallelism(1)`
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