parentheses in default

- Adding SHOW CREATE TABLE into all DEFAULT tests,
  to cover need_parentheses_in_default() for all items
- Fixing a few items not to print parentheses in DEFAULT:
  spatial function-alike predicates, IS_IPV4 and IS_IPV6 functions,
  COLUMN_CHECK() and COLUMN_EXISTS().

1 files changed, 1 insertions, 0 deletions

diff --git a/sql/item_inetfunc.h b/sql/item_inetfunc.h
index 82a4405df1e..f5a0596d860 100644
--- a/sql/item_inetfunc.h
+++ b/sql/item_inetfunc.h
@@ -76,6 +76,7 @@ public:
 
 public:
   virtual longlong val_int();
+  bool need_parentheses_in_default() { return false; }
 
 protected:
   virtual bool calc_value(const String *arg) = 0;