A lot of fixes to Precision math

Mostly about precision/decimals of the results of the operations


include/decimal.h:
  decimal interface changed a little
sql/field.cc:
  a lot of precision/decimals related changes to the Field_new_decimal
sql/field.h:
  Field_new_decimal interface changed
sql/ha_ndbcluster.cc:
  f->precision should be used here
sql/item.cc:
  precision/decimals counting related changes
sql/item.h:
  precision/decimals counting related changes
sql/item_cmpfunc.cc:
  precision/decimals counting related changes
sql/item_cmpfunc.h:
  precision/decimals counting related changes
sql/item_func.cc:
  precision/decimals counting related changes
sql/item_func.h:
  precision/decimals counting related changes
sql/item_sum.cc:
  precision/decimals counting related changes
sql/item_sum.h:
  precision/decimals counting related changes
sql/my_decimal.cc:
  precision/decimals counting related changes
sql/my_decimal.h:
  precision/decimals counting related changes
sql/mysqld.cc:
  precision/decimals counting related changes
sql/set_var.cc:
  precision/decimals counting related changes
sql/sp_head.cc:
  dbug_decimal_print was replaced with dbug_decimal_as_string
sql/sql_class.h:
  div_precincrement variable added
sql/sql_parse.cc:
  precision/decimals counting related changes
sql/sql_select.cc:
  precision/decimals counting related changes
sql/sql_show.cc:
  Field::representation_length was removed
strings/decimal.c:
  decimal_actual_fraction was introduced
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

1 files changed, 6 insertions, 2 deletions

diff --git a/sql/item_func.h b/sql/item_func.h
index 76d1151f3bf..57faa05ce23 100644
--- a/sql/item_func.h
+++ b/sql/item_func.h
@@ -267,6 +267,8 @@ public:
   void fix_length_and_dec()
   { max_length=args[0]->max_length; unsigned_flag=0; }
   void print(String *str);
+  uint decimal_precision() const { return args[0]->decimal_precision(); }
+
 };
 
 
@@ -296,7 +298,7 @@ public:
   longlong val_int();
   my_decimal *val_decimal(my_decimal*);
   enum Item_result result_type () const { return DECIMAL_RESULT; }
-  enum_field_types field_type() const { return MYSQL_TYPE_DECIMAL; }
+  enum_field_types field_type() const { return MYSQL_TYPE_NEWDECIMAL; }
   void fix_length_and_dec() {};
 };
 
@@ -346,6 +348,7 @@ public:
 class Item_func_div :public Item_num_op
 {
 public:
+  uint prec_increment;
   Item_func_div(Item *a,Item *b) :Item_num_op(a,b) {}
   longlong int_op() { DBUG_ASSERT(0); return 0; }
   double real_op();
@@ -390,6 +393,7 @@ public:
   const char *func_name() const { return "-"; }
   void fix_length_and_dec();
   void fix_num_length_and_dec();
+  uint decimal_precision() const { return args[0]->decimal_precision(); }
 };
 
 
@@ -593,7 +597,7 @@ public:
   double real_op();
   longlong int_op();
   my_decimal *decimal_op(my_decimal *);
-  void fix_num_length_and_dec();
+  void fix_length_and_dec();
 };