chucheng92 commented on code in PR #3644:
URL: https://github.com/apache/calcite/pull/3644#discussion_r1465920039


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site/_docs/reference.md:
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@@ -1643,6 +1643,14 @@ Implicit type coercion of following cases are ignored:
 | ARRAY '[' value [, value ]* ']' | Creates an array from a list of values.
 | MAP '[' key, value [, key, value ]* ']' | Creates a map from a list of 
key-value pairs.
 
+### Value constructors by query
+
+| Operator syntax                    | Description |
+|:-----------------------------------|:------------|
+| ARRAY (sub-query)                  | Creates an array from the result of a 
sub-query. Example: `ARRAY(SELECT empno FROM emp)` |

Review Comment:
   Added it.



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