Fixed all reported bugs for dynamic columns.

Bugs fixed:
- Added automatic detection of unsigned arguments to COLUMN_CREATE()
- If string length is not know for COLUMN_GET() use MAX_DYNAMIC_COLUMN_LENGTH instead of MAX_FIELD_BLOBLENGTH
- null_value flag was not propery reset for COLUMN_LIST() and COLUMN_CREATE() which could lead to crashes later:
- lp:778905 Assertion `value->year <= 9999' failed in dynamic_column_date_store
- lp:778912 Assertion `field_pos < field_count' failed in Protocol_text::store in maria-5.3-mwl34

include/ma_dyncol.h:
  Added define for max dynamic column length.
mysql-test/r/cast.result:
  Added test of cast big unsigned int to signed (this test case was missing)
mysql-test/r/dyncol.result:
  Added tests from reported bugs
  Added testing of automatic store of signed/unsigned integers
mysql-test/t/cast.test:
  Added test of cast big unsigned int to signed (this test case was missing)
mysql-test/t/dyncol.test:
  Added tests from reported bugs
  Added testing of automatic store of signed/unsigned integers
sql/item.cc:
  Added assert to catch cases where null_value is not set properly
sql/item_strfunc.cc:
  Added automatic detection of unsigned arguments to COLUMN_CREATE()
  COLUMN_GET() returned wrong value for illegal strings which lead to assert later
  null_value flag was not propery reset for COLUMN_LIST() and COLUMN_CREATE() which could lead to crashes later.
sql/item_strfunc.h:
  If string length is not know for COLUMN_GET() use MAX_DYNAMIC_COLUMN_LENGTH

1 files changed, 1 insertions, 1 deletions

diff --git a/sql/item_strfunc.h b/sql/item_strfunc.h
index 4b88c329610..a0cd2d18308 100644
--- a/sql/item_strfunc.h
+++ b/sql/item_strfunc.h
@@ -913,7 +913,7 @@ public:
   Item_dyncol_get(Item *str, Item *num)
     :Item_str_func(str, num)
   {
-    max_length= MAX_FIELD_BLOBLENGTH;
+    max_length= MAX_DYNAMIC_COLUMN_LENGTH;
   }
   void fix_length_and_dec()
   { maybe_null= 1; }