snuyanzin commented on code in PR #28970:
URL: https://github.com/apache/flink/pull/28970#discussion_r3836645671
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flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/internal/BaseExpressions.java:
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@@ -1967,6 +1968,26 @@ public OutType mapEntries() {
return toApiSpecificExpression(unresolvedCall(MAP_ENTRIES, toExpr()));
}
+ /**
+ * Returns {@code TRUE} if the given key exists in the map, {@code FALSE}
otherwise. Returns
+ * {@code NULL} if the map is {@code NULL}.
+ *
+ * <p>A {@code NULL} key matches a {@code NULL} key in the map. The given
key is cast implicitly
Review Comment:
>If the search key is NULL, the function returns TRUE when the map contains
a NULL key
this probably sounds a little bit better
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