Bug #33544 UDF_INIT member decimals initialized wrong with

           STRING_RESULT argument

There is a "magic" number for precision : NOT_FIXED_DEC. 
This means that the precision is not a fixed number.
But this constant was re-defined in several files and 
was not available to the UDF developers.
 
Moved the NOT_FIXED_DEC definition to the correct header
and removed the redundant definitions.

Backported to 5.6.0  (mysql-next-mr-runtime)

client/sql_string.h:
  moved NOT_FIXED_DEC to the correct header
include/mysql_com.h:
  moved NOT_FIXED_DEC to the correct header
libmysql/libmysql.c:
  moved NOT_FIXED_DEC to the correct header
sql/field.h:
  moved NOT_FIXED_DEC to the correct header
sql/sql_string.h:
  moved NOT_FIXED_DEC to the correct header
storage/ndb/include/kernel/signaldata/DictTabInfo.hpp:
  moved NOT_FIXED_DEC to the correct header

client/sql_string.cc

@@ -23,6 +23,7 @@
 #include <my_sys.h>
 #include <m_string.h>
 #include <m_ctype.h>
+#include <mysql_com.h>
 #ifdef HAVE_FCONVERT
 #include <floatingpoint.h>
 #endif

client/sql_string.h

@@ -22,10 +22,6 @@
 #pragma interface			/* gcc class implementation */
 #endif
 
-#ifndef NOT_FIXED_DEC
-#define NOT_FIXED_DEC			31
-#endif
-
 class String;
 int sortcmp(const String *a,const String *b, CHARSET_INFO *cs);
 String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);

include/mysql_com.h

@@ -524,4 +524,5 @@ uchar *net_store_length(uchar *pkg, ulonglong length);
 #define MYSQL_STMT_HEADER       4
 #define MYSQL_LONG_DATA_HEADER  6
 
+#define NOT_FIXED_DEC           31
 #endif

libmysql/libmysql.c

@@ -3464,10 +3464,7 @@ static void fetch_float_with_conversion(MYSQL_BIND *param, MYSQL_FIELD *field,
     */
     char buff[MAX_DOUBLE_STRING_REP_LENGTH];
     char *end;
-    /* TODO: move this to a header shared between client and server. */
-#define NOT_FIXED_DEC  31
     if (field->decimals >= NOT_FIXED_DEC)
-#undef NOT_FIXED_DEC
     {
       /*
         DBL_DIG below is to ensure that the server and client has the same

sql/field.h

@@ -25,7 +25,6 @@
 #pragma interface			/* gcc class implementation */
 #endif
 
-#define NOT_FIXED_DEC			31
 #define DATETIME_DEC                     6
 const uint32 max_field_size= (uint32) 4294967295U;
 

sql/sql_string.cc

@@ -23,6 +23,7 @@
 #include <my_sys.h>
 #include <m_string.h>
 #include <m_ctype.h>
+#include <mysql_com.h>
 #ifdef HAVE_FCONVERT
 #include <floatingpoint.h>
 #endif

sql/sql_string.h

@@ -22,10 +22,6 @@
 #pragma interface			/* gcc class implementation */
 #endif
 
-#ifndef NOT_FIXED_DEC
-#define NOT_FIXED_DEC			31
-#endif
-
 class String;
 int sortcmp(const String *a,const String *b, CHARSET_INFO *cs);
 String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);

storage/ndb/include/kernel/signaldata/DictTabInfo.hpp

@@ -30,10 +30,6 @@
 
 #define DECIMAL_MAX_LENGTH ((8 * 9) - 8)
 
-#ifndef NOT_FIXED_DEC
-#define NOT_FIXED_DEC                   31
-#endif
-
 C_MODE_START
 extern int decimal_bin_size(int, int);
 C_MODE_END