test cardinality with a single alter table drop add command

mysql-test/suite/tokudb/r/card_add_drop.result

+drop table if exists tt;
+create table tt (a int, b int, c int, d int, key(a), key(b), key(c));
+insert into tt values (0,0,0,0),(1,0,0,0),(2,0,1,0),(3,0,1,0);
+show indexes from tt;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+tt	1	a	1	a	A	NULL	NULL	NULL	YES	BTREE		
+tt	1	b	1	b	A	NULL	NULL	NULL	YES	BTREE		
+tt	1	c	1	c	A	NULL	NULL	NULL	YES	BTREE		
+analyze table tt;
+Table	Op	Msg_type	Msg_text
+test.tt	analyze	status	OK
+show indexes from tt;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+tt	1	a	1	a	A	4	NULL	NULL	YES	BTREE		
+tt	1	b	1	b	A	1	NULL	NULL	YES	BTREE		
+tt	1	c	1	c	A	2	NULL	NULL	YES	BTREE		
+alter table tt drop key b, add key (d);
+show indexes from tt;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+tt	1	a	1	a	A	4	NULL	NULL	YES	BTREE		
+tt	1	c	1	c	A	2	NULL	NULL	YES	BTREE		
+tt	1	d	1	d	A	NULL	NULL	NULL	YES	BTREE		
+analyze table tt;
+Table	Op	Msg_type	Msg_text
+test.tt	analyze	status	OK
+show indexes from tt;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+tt	1	a	1	a	A	4	NULL	NULL	YES	BTREE		
+tt	1	c	1	c	A	2	NULL	NULL	YES	BTREE		
+tt	1	d	1	d	A	1	NULL	NULL	YES	BTREE		
+flush tables;
+show indexes from tt;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+tt	1	a	1	a	A	4	NULL	NULL	YES	BTREE		
+tt	1	c	1	c	A	2	NULL	NULL	YES	BTREE		
+tt	1	d	1	d	A	1	NULL	NULL	YES	BTREE		
+drop table tt;

mysql-test/suite/tokudb/t/card_add_drop.test

+# test that add and drop works
+
+source include/have_tokudb.inc;
+
+disable_warnings;
+drop table if exists tt;
+enable_warnings;
+
+create table tt (a int, b int, c int, d int, key(a), key(b), key(c));
+insert into tt values (0,0,0,0),(1,0,0,0),(2,0,1,0),(3,0,1,0);
+
+# test that analyze computes the correcK
+show indexes from tt;
+analyze table tt;
+show indexes from tt;
+
+# drop b, add d
+alter table tt drop key b, add key (d);
+show indexes from tt;
+analyze table tt;
+show indexes from tt;
+
+# test that cardinality is persistent
+flush tables;
+show indexes from tt;
+
+drop table tt;