Hi Igor,
We discussed the problem with error messages with Sergei and both
agreed that a new error message like:
Subquery is not allowed in '%s'
will be more informative, and it's easy to do.
Why not replace:
bool expr_allows_subselect;
to
const char *clause_that_disallows_subselect;
?
So we can change the grammar to something like this:
| opt_generated_always AS
{ Lex->clause_that_disallows_subselect= "GENERATED ALWAYS AS"; }
virtual_column_func
{ Lex->clause_that_disallows_subselect= NULL; }
The same for other places where we disallow subselects.
This can be done in 10.4 before your patch, as a separate commit.
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