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  1. MariaDB Server
  2. MDEV-19888

Add abstract class Item_json_func

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      Client-server protocol will be extended soon to return extended data type information in result set metadata.
      All functions returning JSON will mark themself of having the "json" format.

      In order to reuse the code easier, let's introduce a new abstract class Item_json_func and derive all Item_str_func descendants returning JSON (and implemented in item_jsonfunc.h) from this new class.

      So the class hierarchy in item_jsonfunc.h will look like this:

      Item_str_func
        Item_json_func
          Item_func_json_query
          Item_json_str_multipath
            Item_func_json_extract
            Item_func_json_array_append
              Item_func_json_array_insert
            Item_func_json_insert
            Item_func_json_remove
            Item_func_json_search
          Item_func_json_array
            Item_func_json_object
            Item_func_json_merge
              Item_func_json_merge_patch
          Item_func_json_format
        Item_func_json_value
        Item_func_json_quote
        Item_func_json_unquote
        Item_func_json_type
        Item_func_json_keys
      

      Note, we earlier did the same for other data types, e.g.:

      • Item_timefunc
      • Item_datefunc
      • Item_datetimefunc
      • Item_geometry_func
        etc.

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              bar Alexander Barkov
              bar Alexander Barkov
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