Bug#36031 Test funcs_1.<engine>_views failing on Windows

The problem is a hack in mysqltest.c::append_field that modifies
the exponential notation of floating point numbers by removing a
zero after the the symbol 'e' (eg: 00001.2e+018 is converted to
00001.2e+18) but does not take into account the zerofill affect
in the start of the string.

The solution is to check if the field was zero filled and insert
a zero at the start of the string if a zero after the exponential
notation symbol is removed.


client/mysqltest.c:
  Preserve zerofill affect when removing a zero after
  the exponential notation symbol.

client/mysqltest.c

@@ -5595,7 +5595,7 @@ void fix_win_paths(const char *val, int len)
 */
 
 void append_field(DYNAMIC_STRING *ds, uint col_idx, MYSQL_FIELD* field,
-                  const char* val, ulonglong len, my_bool is_null)
+                  char* val, ulonglong len, my_bool is_null)
 {
   if (col_idx < max_replace_column && replace_column[col_idx])
   {
@@ -5618,9 +5618,18 @@ void append_field(DYNAMIC_STRING *ds, uint col_idx, MYSQL_FIELD* field,
         (start[1] == '-' || start[1] == '+') && start[2] == '0')
     {
       start+=2; /* Now points at first '0' */
-      /* Move all chars after the first '0' one step left */
-      memmove(start, start + 1, strlen(start));
-      len--;
+      if (field->flags & ZEROFILL_FLAG)
+      {
+        /* Move all chars before the first '0' one step right */
+        memmove(val + 1, val, start - val);
+        *val= '0';
+      }
+      else
+      {
+        /* Move all chars after the first '0' one step left */
+        memmove(start, start + 1, strlen(start));
+        len--;
+      }
     }
   }
 #endif
@@ -5659,7 +5668,7 @@ void append_result(DYNAMIC_STRING *ds, MYSQL_RES *res)
     lengths = mysql_fetch_lengths(res);
     for (i = 0; i < num_fields; i++)
       append_field(ds, i, &fields[i],
-                   (const char*)row[i], lengths[i], !row[i]);
+                   row[i], lengths[i], !row[i]);
     if (!display_result_vertically)
       dynstr_append_mem(ds, "\n", 1);
   }
@@ -5708,7 +5717,7 @@ void append_stmt_result(DYNAMIC_STRING *ds, MYSQL_STMT *stmt,
   while (mysql_stmt_fetch(stmt) == 0)
   {
     for (i= 0; i < num_fields; i++)
-      append_field(ds, i, &fields[i], (const char *) my_bind[i].buffer,
+      append_field(ds, i, &fields[i], my_bind[i].buffer,
                    *my_bind[i].length, *my_bind[i].is_null);
     if (!display_result_vertically)
       dynstr_append_mem(ds, "\n", 1);