[jira] [Created] (METAMODEL-195) Scalar function to get key from a MAP type field

["Kasper Sørensen (JIRA)" <ji...@apache.org>]

Kasper Sørensen created METAMODEL-195:
-----------------------------------------

             Summary: Scalar function to get key from a MAP type field
                 Key: METAMODEL-195
                 URL: https://issues.apache.org/jira/browse/METAMODEL-195
             Project: Apache MetaModel
          Issue Type: Bug
            Reporter: Kasper Sørensen


Now that we have support for scalar functions, and we also support a host of key/value or document oriented datastores, I think it would be really natural to support a function for getting a value inside a map.

Example:
{code}
SELECT MAP_VALUE(address, 'street') FROM contacts
{code}

Ideally the function would allow for a full "path" of keys so that you could have maps-within-maps and so on.

{code}
SELECT MAP_VALUE(address, 'homeaddress.street') FROM contacts
{code}

Even more ideally we would also add a bit of query parser logic to allow expressing the path as part of the operand itself:

{code}
SELECT address.homeaddress.street FROM contacts
{code}



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