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https://issues.apache.org/jira/browse/METAMODEL-195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15015411#comment-15015411
]
ASF GitHub Bot commented on METAMODEL-195:
------------------------------------------
Github user albertostratio commented on the pull request:
https://github.com/apache/metamodel/pull/70#issuecomment-158321263
@kaspersorensen are you still working on this PR? I think this function is
pretty useful.
And, I've got a question on this... Will it fetch all the "results" for the
following json?:
```
{
"data": {
"results": [
{
"date": "2015-09-16 15:37:38",
"email": "[email protected]",
"password": 12345,
"source_type": "leakage"
},
{
"date": "2015-12-23 12:37:38",
"email": "[email protected]",
"password": 78921,
"source_type": "another"
}
]
}
}
```
> 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: Improvement
> 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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