goldmedal opened a new issue, #11785:
URL: https://github.com/apache/datafusion/issues/11785

   ### Describe the bug
   
   Currently, we support creating a map like
   ```
   SELECT MAKE_MAP(1, 'a', 2, 'b', 3, 'c');
   ----
   {1: a, 2: b, 3: c}
   ```
   However, we can't access this map if its key isn't a string.
   ```
   SELECT MAKE_MAP(1, 'a', 2, 'b', 3, 'c')[1]
   ```
   It will get the error
   ```
   External error: query failed: DataFusion error: Error during planning: Error 
during planning: Coercion from [Map(Field { name: "entries", data_type: 
Struct([Field { name: "key", data_type: Int64, nullable: false, dict_id: 0, 
dict_is_ordered: false, metadata: {} }, Field { name: "value", data_type: Utf8, 
nullable: true, dict_id: 0, dict_is_ordered: false, metadata: {} }]), nullable: 
false, dict_id: 0, dict_is_ordered: false, metadata: {} }, false), Int64] to 
the signature ArraySignature(ArrayAndIndex) failed. No function matches the 
given name and argument types 'array_element(Map(Field { name: "entries", 
data_type: Struct([Field { name: "key", data_type: Int64, nullable: false, 
dict_id: 0, dict_is_ordered: false, metadata: {} }, Field { name: "value", 
data_type: Utf8, nullable: true, dict_id: 0, dict_is_ordered: false, metadata: 
{} }]), nullable: false, dict_id: 0, dict_is_ordered: false, metadata: {} }, 
false), Int64)'. You might need to add explicit type casts.
           Candidate functions:
           array_element(array, index)
   ```
   
   If the key is a string, it works well.
   ```
   query T
   SELECT MAKE_MAP('1', 'a', '2', 'b', '3', 'c')['1']
   ----
   a
   ```
   
   ### To Reproduce
   
   As mentioned above, create a map with non-string keys and try to access it 
by the key.
   
   ### Expected behavior
   
   Given the SQL
   ```
   SELECT MAKE_MAP(1, 'a', 2, 'b', 3, 'c')[1]
   ```
   It should return the value `'a'`.
   
   ### Additional context
   
   https://github.com/apache/datafusion/pull/11780#discussion_r1702121012


-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org.apache.org

For queries about this service, please contact Infrastructure at:
us...@infra.apache.org


---------------------------------------------------------------------
To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org
For additional commands, e-mail: github-h...@datafusion.apache.org

Reply via email to