Document map subscript behavior for non-existent keys

trinodb · Apr 3, 2024 · 5d91660 · 5d91660
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commit 5d91660
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/docs/src/main/sphinx/functions/map.md b/docs/src/main/sphinx/functions/map.md
@@ -2,7 +2,9 @@
 
 ## Subscript operator: \[\]
 
-The `[]` operator is used to retrieve the value corresponding to a given key from a map:
+The `[]` operator is used to retrieve the value corresponding to a given key from a map.
+This operator throws an error if the key is not contained in the map.
+See also `element_at` function that returns `NULL` in such case.
 
 ```
 SELECT name_to_age_map['Bob'] AS bob_age;