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Re: getting all name-value pairs from a dynamic column



>>>>> "MARK" == MARK CALLAGHAN <mdcallag@xxxxxxxxx> writes:

MARK> These docs are excellent -- http://kb.askmonty.org/en/dynamic-columns


MARK> How do you fetch all name-value pairs from a dynamic column in a
MARK> format that can be consumed by a client?

Do you mean from SQL or in the client library?

MARK> The client can select the
MARK> column as is but then must know how mariadb encoded it.

Sorry, don't understand the question.

When asking for a value for a column in the client , you get back a
structure that tells how the data is encoded. See the 'struct

MARK> The function
MARK> column_list returns the column names.

Yes, even if the column names are numbers for the moment.

MARK> If there were a function that
MARK> encoded all name-value pairs as JSON, then the client could do
MARK> something like this and be able to decode the result:
MARK>   select column_json(dynamic_column_name) from t where ...

We just got funding for half of the future planned work for dynamic
columns.  We will soon start looking at how to encode names for
dynamic columns.


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