VIEW".

mysql_list_fields() C API function would incorrectly set MYSQL_FIELD::decimals
member for some view columns.

The problem was in an incomplete implementation of 
Item_ident_for_show::make_field(), which is responsible for view
columns metadata.


sql/item.cc:
  A fix for Bug#29306 -- properly initialize decimals in 
  Item_ident_for_show::make_field
tests/mysql_client_test.c:
  Add a test case forBug#29306. Fix warnings.