added primary key EQ search.

test/sql/r/select_pkey.result

@@ -0,0 +1,30 @@
+install plugin mroonga soname 'libmroonga.so';
+set storage_engine=mroonga;
+drop table if exists t1, t2, t3;
+create table t1(c1 int primary key, c2 int, c3 int);
+insert into t1 values (1, 10, 100);
+insert into t1 values (2, 30, 500);
+insert into t1 values (5, 20, 200);
+insert into t1 values (3, 60, 300);
+insert into t1 values (4, 50, 600);
+insert into t1 values (6, 40, 400);
+select * from t1 where c1=1;
+c1	c2	c3
+1	10	100
+select * from t1 where c1=2;
+c1	c2	c3
+2	30	500
+select * from t1 where c1=3;
+c1	c2	c3
+3	60	300
+select * from t1 where c1=4;
+c1	c2	c3
+4	50	600
+select * from t1 where c1=5;
+c1	c2	c3
+5	20	200
+select * from t1 where c1=6;
+c1	c2	c3
+6	40	400
+drop table t1;
+uninstall plugin mroonga;

test/sql/t/select_pkey.test

@@ -0,0 +1,26 @@
+--disable_warnings
+install plugin mroonga soname 'libmroonga.so';
+set storage_engine=mroonga;
+drop table if exists t1, t2, t3;
+--enable_warnings
+
+create table t1(c1 int primary key, c2 int, c3 int);
+insert into t1 values (1, 10, 100);
+insert into t1 values (2, 30, 500);
+insert into t1 values (5, 20, 200);
+insert into t1 values (3, 60, 300);
+insert into t1 values (4, 50, 600);
+insert into t1 values (6, 40, 400);
+
+select * from t1 where c1=1;
+select * from t1 where c1=2;
+select * from t1 where c1=3;
+select * from t1 where c1=4;
+select * from t1 where c1=5;
+select * from t1 where c1=6;
+
+drop table t1;
+
+--disable_warnings
+uninstall plugin mroonga;
+--enable_warnings