snuyanzin commented on code in PR #22745:
URL: https://github.com/apache/flink/pull/22745#discussion_r1251041965
##########
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/Expressions.java:
##########
@@ -553,6 +553,23 @@ public static ApiExpression mapFromArrays(Object key,
Object value) {
objectToExpression(value));
}
+ /**
+ * Creates a map from an array of entries (row with two fields).
+ *
+ * <pre>{@code
+ * table.select(
+ * mapFromEntries(
+ * array(row(key1, 1), row(key2, 2), row(key3, 3))
+ * ))
+ * }</pre>
+ *
+ * <p>Note If the number of fields in a row array is not 2 or the key of a
row array is null, an
+ * error is returned.
Review Comment:
>or the key of a row array is null, an
* error is returned.
I didn't get it, could you elaborate please?
i have a query with null key
```sql
SELECT map_from_entries(ARRAY[ROW(CAST(NULL AS INT), 'value')]);
```
and it doesn't return error
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