Redo of changeset I commited, but failed to push
mysql-test/r/bool.result:
Added tests for boolean operators in select part
mysql-test/t/bool.test:
Added tests for boolean operators in select part
This is coded to not cause a speed impact on top level AND expressions where we don't care if an AND expression returns 0 or NULL
mysql-test/r/bdb.result:
Fix results after serges last patch
mysql-test/r/innodb.result:
Fix results after serges last patch
mysql-test/r/null.result:
Update for new AND handling of NULL
scripts/mysqld_safe.sh:
Fix 'isroot' test to work even if user is not root
sql/item.h:
Fixed that NULL and 0 returns 0 instead of NULL
sql/item_cmpfunc.cc:
Fixed that NULL and 0 returns 0 instead of NULL
sql/item_cmpfunc.h:
Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_base.cc:
Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_parse.cc:
Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_select.cc:
Fixed that NULL and 0 returns 0 instead of NULL
sql/sql_yacc.yy:
Fixed that NULL and 0 returns 0 instead of NULL
