MDEV-11597 Assertion when doing select from virtual column with impossible value

- Changed error handlers interface so that they can change error level in
  the handler
- Give warnings and errors when calculating virtual columns
- On insert/update error is fatal in strict mode.
- SELECT and DELETE will only give a warning if a virtual field generates an error
- Added VCOL_UPDATE_FOR_DELETE and VCOL_UPDATE_INDEX_FOR_REPLACE to be able to
  easily detect in update_virtual_fields() if we should use an error
  handler to mask errors or not.

1 files changed, 2 insertions, 2 deletions

diff --git a/sql/handler.cc b/sql/handler.cc
index a91a97598d6..f06c5d71a5e 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -4974,7 +4974,7 @@ public:
   bool handle_condition(THD *thd,
                         uint sql_errno,
                         const char* sqlstate,
-                        Sql_condition::enum_warning_level level,
+                        Sql_condition::enum_warning_level *level,
                         const char* msg,
                         Sql_condition ** cond_hdl)
   {
@@ -4987,7 +4987,7 @@ public:
       return TRUE;
     }
 
-    if (level == Sql_condition::WARN_LEVEL_ERROR)
+    if (*level == Sql_condition::WARN_LEVEL_ERROR)
       m_unhandled_errors++;
     return FALSE;
   }