MDEV-13526 Add Type_handler::Item_val_bool()

sql/item.cc

@@ -109,36 +109,6 @@ void Item::push_note_converted_to_positive_complement(THD *thd)
 }
 
 
-/**
-  @todo
-    Make this functions class dependent
-*/
-
-bool Item::val_bool()
-{
-  switch(result_type()) {
-  case INT_RESULT:
-    return val_int() != 0;
-  case DECIMAL_RESULT:
-  {
-    my_decimal decimal_value;
-    my_decimal *val= val_decimal(&decimal_value);
-    if (val)
-      return !my_decimal_is_zero(val);
-    return 0;
-  }
-  case REAL_RESULT:
-  case STRING_RESULT:
-    return val_real() != 0.0;
-  case ROW_RESULT:
-  case TIME_RESULT:
-    DBUG_ASSERT(0);
-    return 0;                                   // Wrong (but safe)
-  }
-  return 0;                                   // Wrong (but safe)
-}
-
-
 /**
   Get date/time/datetime.
   Optionally extend TIME result to DATETIME.

sql/item.h

@@ -1047,7 +1047,10 @@ class Item: public Value_source,
       FALSE value is false or NULL
       TRUE value is true (not equal to 0)
   */
-  virtual bool val_bool();
+  virtual bool val_bool()
+  {
+    return type_handler()->Item_val_bool(this);
+  }
   virtual String *val_nodeset(String*) { return 0; }
 
   /*

sql/sql_type.cc

@@ -3077,6 +3077,38 @@ bool Type_handler_geometry::
 #endif
 
 
+/*************************************************************************/
+
+bool Type_handler_real_result::Item_val_bool(Item *item) const
+{
+  return item->val_real() != 0.0;
+}
+
+bool Type_handler_int_result::Item_val_bool(Item *item) const
+{
+  return item->val_int() != 0;
+}
+
+bool Type_handler_decimal_result::Item_val_bool(Item *item) const
+{
+  my_decimal decimal_value;
+  my_decimal *val= item->val_decimal(&decimal_value);
+  if (val)
+    return !my_decimal_is_zero(val);
+  return false;
+}
+
+bool Type_handler_temporal_result::Item_val_bool(Item *item) const
+{
+  return item->val_real() != 0.0;
+}
+
+bool Type_handler_string_result::Item_val_bool(Item *item) const
+{
+  return item->val_real() != 0.0;
+}
+
+
 /*************************************************************************/
 
 longlong Type_handler_real_result::

sql/sql_type.h

@@ -891,6 +891,7 @@ class Type_handler
   virtual
   bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const= 0;
 
+  virtual bool Item_val_bool(Item *item) const= 0;
   virtual longlong Item_val_int_signed_typecast(Item *item) const= 0;
   virtual longlong Item_val_int_unsigned_typecast(Item *item) const= 0;
 
@@ -1147,6 +1148,11 @@ class Type_handler_row: public Type_handler
     DBUG_ASSERT(0);
     return true;
   }
+  bool Item_val_bool(Item *item) const
+  {
+    DBUG_ASSERT(0);
+    return false;
+  }
   longlong Item_val_int_signed_typecast(Item *item) const
   {
     DBUG_ASSERT(0);
@@ -1352,6 +1358,7 @@ class Type_handler_real_result: public Type_handler_numeric
   bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
   bool Item_func_signed_fix_length_and_dec(Item_func_signed *item) const;
   bool Item_func_unsigned_fix_length_and_dec(Item_func_unsigned *item) const;
+  bool Item_val_bool(Item *item) const;
   longlong Item_val_int_signed_typecast(Item *item) const;
   longlong Item_val_int_unsigned_typecast(Item *item) const;
   String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
@@ -1427,6 +1434,7 @@ class Type_handler_decimal_result: public Type_handler_numeric
   bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
   bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
   bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
+  bool Item_val_bool(Item *item) const;
   longlong Item_val_int_signed_typecast(Item *item) const;
   longlong Item_val_int_unsigned_typecast(Item *item) const;
   String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
@@ -1494,6 +1502,7 @@ class Type_handler_int_result: public Type_handler_numeric
   bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
   bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
   bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
+  bool Item_val_bool(Item *item) const;
   longlong Item_val_int_signed_typecast(Item *item) const;
   longlong Item_val_int_unsigned_typecast(Item *item) const;
   String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
@@ -1564,6 +1573,7 @@ class Type_handler_temporal_result: public Type_handler
   bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *) const;
   bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *) const;
   bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
+  bool Item_val_bool(Item *item) const;
   longlong Item_val_int_signed_typecast(Item *item) const;
   longlong Item_val_int_unsigned_typecast(Item *item) const;
   String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;
@@ -1673,6 +1683,7 @@ class Type_handler_string_result: public Type_handler
   bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *) const;
   bool Item_func_signed_fix_length_and_dec(Item_func_signed *item) const;
   bool Item_func_unsigned_fix_length_and_dec(Item_func_unsigned *item) const;
+  bool Item_val_bool(Item *item) const;
   longlong Item_val_int_signed_typecast(Item *item) const;
   longlong Item_val_int_unsigned_typecast(Item *item) const;
   String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str) const;