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  1. MariaDB Server
  2. MDEV-7606

better support for nested dynamic columns

        Details

        • Type: Task
        • Status: Open
        • Priority: Major
        • Resolution: Unresolved
        • Fix Version/s: None
        • Component/s: Dynamic Columns
        • Labels:
          None

          Description

          Judging from questions on #maria channel, nested dynamic columns seem to be fairly popular. But editing a column value few levels deep is very awkward. Extracting is a bit better but still inconvenient.

          It would be good to have COLUMN_GET and COLUMN_ADD variants for nested dynamic columns. For example

          SELECT COLUMN_GET(blob, a, b, c AS type);

          as an alternative to

          SELECT COLUMN_GET(COLUMN_GET(COLUMN_GET(blob, a AS blob), b AS blob), c AS type);

          And

          SELECT COLUMN_ADD(blob, a, b, c, value);

          as an alternative to

          SELECT COLUMN_ADD(blob, a, COLUMN_ADD(COLUMN_GET(blob, a AS blob), b, COLUMN_ADD(COLUMN_GET(COLUMN_GET(blob, a AS blob), b AS blob), c, value)));

          Note the syntax is just an example. It's probably not possible implement it as written above (might conflict with the existing COLUMN_ADD syntax).

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                digitalfire Daniel Lopez added a comment -

                COLUMN_ADD & COLUMN_DELETE are quite cumbersome when the nest starts getting past 2 levels. Besides the lack of documentation for nested data. To wrap your head around the logic using COLUMN_GET to maneuver through the dynamic columns can get very complex, very quickly.

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                digitalfire Daniel Lopez added a comment - COLUMN_ADD & COLUMN_DELETE are quite cumbersome when the nest starts getting past 2 levels. Besides the lack of documentation for nested data. To wrap your head around the logic using COLUMN_GET to maneuver through the dynamic columns can get very complex, very quickly.

                  People

                  • Assignee:
                    Unassigned
                    Reporter:
                    serg Sergei Golubchik
                  • Votes:
                    1 Vote for this issue
                    Watchers:
                    2 Start watching this issue

                    Dates

                    • Created:
                      Updated: