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https://issues.apache.org/jira/browse/FLINK-7062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16653375#comment-16653375
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ASF GitHub Bot commented on FLINK-7062:
---------------------------------------
twalthr commented on a change in pull request #6815: [FLINK-7062][cep][table]
Added basic support for MATCH_RECOGNIZE
URL: https://github.com/apache/flink/pull/6815#discussion_r225879546
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/MatchCodeGenerator.scala
##########
@@ -118,14 +145,19 @@ class MatchCodeGenerator(
GeneratedFunction(funcName, returnType, funcCode)
}
- def generatePartitionKeyAccess(
+ /**
+ * Extracts partition keys from any element of the match
+ *
+ * @param partitionKey partition key to be extracted
+ * @return generated code for the given key
+ */
+ private def generatePartitionKeyAccess(
partitionKey: RexInputRef
) : GeneratedExpression = {
- // extracts partition keys from any element of the match
val eventNameTerm = newName("event")
val eventTypeTerm = boxedTypeTermForTypeInfo(input)
- val keyAccess = generateFieldAccess(input, eventNameTerm,
partitionKey.getIndex)
+ val keyAccess = generateNullableInputFieldAccess(input, eventNameTerm,
partitionKey.getIndex)
Review comment:
Can the input be nullable? Otherwise we can use a different method that does
not check for null.
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> Support the basic functionality of MATCH_RECOGNIZE
> --------------------------------------------------
>
> Key: FLINK-7062
> URL: https://issues.apache.org/jira/browse/FLINK-7062
> Project: Flink
> Issue Type: Sub-task
> Components: CEP, Table API & SQL
> Reporter: Dian Fu
> Assignee: Dian Fu
> Priority: Major
> Labels: pull-request-available
>
> In this JIRA, we will support the basic functionality of {{MATCH_RECOGNIZE}}
> in Flink SQL API which includes the support of syntax {{MEASURES}},
> {{PATTERN}} and {{DEFINE}}. This would allow users write basic cep use cases
> with SQL like the following example:
> {code}
> SELECT T.aid, T.bid, T.cid
> FROM MyTable
> MATCH_RECOGNIZE (
> MEASURES
> A.id AS aid,
> B.id AS bid,
> C.id AS cid
> PATTERN (A B C)
> DEFINE
> A AS A.name = 'a',
> B AS B.name = 'b',
> C AS C.name = 'c'
> ) AS T
> {code}
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