Kasper Sørensen created METAMODEL-195:
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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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