Merge remote-tracking branch 'origin/10.2' into 10.3

1 files changed, 24 insertions, 0 deletions

diff --git a/sql/item.h b/sql/item.h
index 54c4e9a5504..a40f0ab082e 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -1342,6 +1342,13 @@ public:
     a constant expression. Used in the optimizer to propagate basic constants.
   */
   virtual bool basic_const_item() const { return 0; }
+  /*
+    Determines if the expression is allowed as
+    a virtual column assignment source:
+      INSERT INTO t1 (vcol) VALUES (10)    -> error
+      INSERT INTO t1 (vcol) VALUES (NULL)  -> ok
+  */
+  virtual bool vcol_assignment_allowed_value() const { return false; }
   /* cloning of constant items (0 if it is not const) */
   virtual Item *clone_item(THD *thd) { return 0; }
   virtual Item* build_clone(THD *thd) { return get_copy(thd); }
@@ -3267,6 +3274,7 @@ public:
     collation.set(cs, DERIVATION_IGNORABLE, MY_REPERTOIRE_ASCII);
   }
   enum Type type() const { return NULL_ITEM; }
+  bool vcol_assignment_allowed_value() const { return true; }
   bool eq(const Item *item, bool binary_cmp) const { return null_eq(item); }
   double val_real();
   longlong val_int();
@@ -3516,6 +3524,21 @@ public:
   const Type_handler *type_handler() const
   { return Type_handler_hybrid_field_type::type_handler(); }
 
+  bool vcol_assignment_allowed_value() const
+  {
+    switch (state) {
+    case NULL_VALUE:
+    case DEFAULT_VALUE:
+    case IGNORE_VALUE:
+      return true;
+    case NO_VALUE:
+    case SHORT_DATA_VALUE:
+    case LONG_DATA_VALUE:
+      break;
+    }
+    return false;
+  }
+
   Field::geometry_type get_geometry_type() const
   { return Type_geometry_attributes::get_geometry_type(); };
 
@@ -5787,6 +5810,7 @@ public:
                 &null_clex_str),
      arg(NULL), cached_field(NULL) {}
   enum Type type() const { return DEFAULT_VALUE_ITEM; }
+  bool vcol_assignment_allowed_value() const { return arg == NULL; }
   bool eq(const Item *item, bool binary_cmp) const;
   bool fix_fields(THD *, Item **);
   void cleanup();