MDEV-8715 - Obsolete sql_alloc() in favor of THD::alloc() and thd_alloc()

The following left in semi-improved state to keep patch size reasonable:
- Field operator new: left thd_alloc(current_thd)
- Sql_alloc operator new: left thd_alloc(thd_get_current_thd())
- Item_args constructors: left thd_alloc(thd)
- Item_func_interval::fix_length_and_dec(): no THD arg, have to call current_thd
- Item_func_dyncol_exists::val_int(): same
- Item_dyncol_get::val_str(): same
- Item_dyncol_get::val_int(): same
- Item_dyncol_get::val_real(): same
- Item_dyncol_get::val_decimal(): same
- Item_singlerow_subselect::fix_length_and_dec(): same

1 files changed, 4 insertions, 3 deletions

diff --git a/sql/sql_list.h b/sql/sql_list.h
index 6f01b64df70..718306c2193 100644
--- a/sql/sql_list.h
+++ b/sql/sql_list.h
@@ -22,7 +22,8 @@
 #include "my_sys.h"                    /* alloc_root, TRASH, MY_WME,
                                           MY_FAE, MY_ALLOW_ZERO_PTR */
 #include "m_string.h"                           /* bfill */
-#include "thr_malloc.h"                         /* sql_alloc */
+
+THD *thd_get_current_thd();
 
 /* mysql standard class memory allocator */
 
@@ -31,11 +32,11 @@ class Sql_alloc
 public:
   static void *operator new(size_t size) throw ()
   {
-    return sql_alloc(size);
+    return thd_alloc(thd_get_current_thd(), size);
   }
   static void *operator new[](size_t size) throw ()
   {
-    return sql_alloc(size);
+    return thd_alloc(thd_get_current_thd(), size);
   }
   static void *operator new[](size_t size, MEM_ROOT *mem_root) throw ()
   { return alloc_root(mem_root, size); }