Last round of review fixes


BUILD/compile-pentium-gcov:
  No change
sql/ha_ndbcluster.h:
  Last round of review changes
sql/ha_partition.h:
  Last round of review changes
sql/handler.h:
  Last round of review changes
sql/item_sum.cc:
  Last round of review changes
sql/sql_acl.cc:
  Last round of review changes
sql/sql_insert.cc:
  Last round of review changes
sql/sql_select.cc:
  Last round of review changes
sql/sql_table.cc:
  Last round of review changes
sql/sql_union.cc:
  Last round of review changes
sql/sql_update.cc:
  Last round of review changes