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https://issues.apache.org/jira/browse/FLINK-7599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16703163#comment-16703163
]
ASF GitHub Bot commented on FLINK-7599:
---------------------------------------
twalthr commented on a change in pull request #7177: [FLINK-7599] [table]
Support for aggregates in MATCH_RECOGNIZE
URL: https://github.com/apache/flink/pull/7177#discussion_r237479598
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/MatchCodeGenerator.scala
##########
@@ -445,4 +498,223 @@ class MatchCodeGenerator(
generateFieldAccess(patternVariableRef.copy(code = NO_CODE),
fieldRef.getIndex)
}
+
+ class AggBuilder(variable: String) {
+
+ private val aggregates = new mutable.ListBuffer[RexCall]()
+
+ private val variableUID = newName("variable")
+
+ private val resultRowTerm = newName(s"aggRow_$variableUID")
+
+ private val rowTypeTerm = "org.apache.flink.types.Row"
+
+ def getOrAddAggregation(call: RexCall): GeneratedExpression = {
+ reusableInputUnboxingExprs.get((call.toString, 0)) match {
+ case Some(expr) =>
+ expr
+
+ case None =>
+ val exp: GeneratedExpression = generateAggAccess(call)
+ aggregates += call
+ reusableInputUnboxingExprs((call.toString, 0)) = exp
+ exp.copy(code = NO_CODE)
+ }
+ }
+
+ private def generateAggAccess(call: RexCall) = {
+ val singleResultTerm = newName("result")
+ val singleResultNullTerm = newName("nullTerm")
+ val singleResultType = FlinkTypeFactory.toTypeInfo(call.`type`)
+ val singleResultTypeTerm = boxedTypeTermForTypeInfo(singleResultType)
+
+ val patternName = findEventsByPatternName(variable)
+
+ val codeForAgg =
+ j"""
+ |$rowTypeTerm $resultRowTerm =
calculateAgg_$variableUID(${patternName.resultTerm});
+ |""".stripMargin
+
+ reusablePerRecordStatements += codeForAgg
+
+ val defaultValue = primitiveDefaultValue(singleResultType)
+ val codeForSingleAgg =
+ j"""
+ |boolean $singleResultNullTerm;
+ |$singleResultTypeTerm $singleResultTerm = ($singleResultTypeTerm)
$resultRowTerm
Review comment:
Something is wrong here. You are casting a `Row` into the result type of the
aggregation?
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> Support aggregation functions in the define and measures clause of
> MatchRecognize
> ---------------------------------------------------------------------------------
>
> Key: FLINK-7599
> URL: https://issues.apache.org/jira/browse/FLINK-7599
> Project: Flink
> Issue Type: Sub-task
> Components: CEP, Table API & SQL
> Reporter: Dian Fu
> Assignee: Dawid Wysakowicz
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.8.0
>
>
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