dilipbiswal commented on code in PR #55629:
URL: https://github.com/apache/spark/pull/55629#discussion_r3189883296
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala:
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@@ -657,6 +657,34 @@ trait CheckAnalysis extends LookupCatalog with
QueryErrorsBase with PlanToString
messageParameters = Map.empty)
}
+ // Reject streaming inputs early. The optimizer rewrite is built
around an
+ // unconditioned cross-product fed into a global `Aggregate` keyed
by a per-row
+ // identifier (`__qid`). That shape doesn't compose cleanly with
structured-streaming
+ // semantics: a stateful aggregate keyed by a freshly-generated
identifier accumulates
+ // state indefinitely (every batch creates new keys, old keys never
match again) and a
+ // cross-product against a streaming right side has no bounded state
model today.
+ // Failing at analysis time is clearer than letting either fail at
runtime. Streaming
+ // support is tracked as a follow-up; resolving it likely comes from
a different
+ // grouping strategy or a dedicated physical operator.
+ case j: NearestByJoin if j.isStreaming =>
+ j.failAnalysis(
+ errorClass = "NEAREST_BY_JOIN.STREAMING_NOT_SUPPORTED",
+ messageParameters = Map.empty)
Review Comment:
@gengliangwang Thanks !! Will follow-up on this.
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