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  1. MariaDB Server
  2. MDEV-11517

Confusing error message upon attempt to create an indexed virtual column with partially supported functions

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      Note: I've seen from the tests that it's expected for now, but I think it could be improved.

      This works

      		 
      MariaDB [test]> create table t1 (a datetime as (now()) VIRTUAL);
      		 
      Query OK, 0 rows affected (0.40 sec)

      This does not work

      		 
      MariaDB [test]> create table t2 (a datetime as (now()) VIRTUAL, INDEX(a));
      		 
      ERROR 1901 (HY000): Function or expression 'current_timestamp()' cannot be used in the GENERATED ALWAYS AS clause of `a`

      The problem is not that it doesn't work, but that it pretends that NOW cannot be used at all, while it's only so for indexed columns. Maybe we need a different error message if there is no suitable one.

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          relates to

          Task - A task that needs to be done. MDEV-5800 indexes on virtual (not materialized) columns

          • Blocker - Blocks development and/or testing work, production could not run.
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              serg Sergei Golubchik
              elenst Elena Stepanova
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