snuyanzin commented on code in PR #27210:
URL: https://github.com/apache/flink/pull/27210#discussion_r2509827017
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/LogicalUnnestRule.java:
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@@ -161,6 +167,35 @@ private RelNode getRel(RelNode rel) {
return rel;
}
+ /**
+ * If unnesting type is {@code NOT NULL} however at the same time {@code
LEFT JOIN} makes it
+ * nullable, this method adjust nullability by inserting extra {@code
CAST}.
+ */
+ private LogicalProject
getLogicalProjectWithAdjustNullability(LogicalProject logicalProject) {
Review Comment:
makes sense, done
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