MDEV-7901: re-implement analyze table for low impact

Table before collecting engine independent statistics now is reopened in read mode,
InnoDB allow write operations in this case.

mysql-test/r/stat_tables_innodb_debug.result

+# 
+# MDEV-7901: re-implement analyze table for low impact
+# 
+create table t1 (a int, b int, c int, key IDX1(a), key IDX2(a,b)) engine=innodb;
+insert into t1 select seq/10, seq/2, seq from seq_0_to_9;
+SET DEBUG_SYNC='statistics_collection_start1 SIGNAL analyzing WAIT_FOR written';
+analyze table t1 persistent for all;
+connect  con1, localhost, root,,;
+connection con1;
+SET DEBUG_SYNC= 'now WAIT_FOR analyzing';
+select count(*) from t1;
+count(*)
+10
+insert into t1 values (333,333,333);
+update t1 set a=1;
+SET DEBUG_SYNC= 'now SIGNAL written';
+connection default;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Engine-independent statistics collected
+test.t1	analyze	status	OK
+select count(*) from t1;
+count(*)
+11
+set debug_sync='RESET';
+drop table t1;

mysql-test/r/stat_tables_myisam_debug.result

+# 
+# MDEV-7901: re-implement analyze table for low impact
+# 
+create table t1 (a int, b int, c int, key IDX1(a), key IDX2(a,b)) engine=myisam;
+insert into t1 select seq/10, seq/2, seq from seq_0_to_9;
+SET DEBUG_SYNC='statistics_collection_start1 SIGNAL analyzing WAIT_FOR written';
+analyze table t1 persistent for all;
+connect  con1, localhost, root,,;
+connection con1;
+SET DEBUG_SYNC= 'now WAIT_FOR analyzing';
+select count(*) from t1;
+count(*)
+10
+insert into t1 values (333,333,333);
+SET DEBUG_SYNC= 'now SIGNAL written';
+connection default;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Engine-independent statistics collected
+test.t1	analyze	status	Table is already up to date
+select count(*) from t1;
+count(*)
+11
+set debug_sync='RESET';
+drop table t1;

mysql-test/t/stat_tables_innodb_debug.test

+--source include/have_innodb.inc
+--source include/have_sequence.inc
+--source include/have_stat_tables.inc
+--source include/have_debug_sync.inc
+--source include/not_embedded.inc
+
+--echo # 
+--echo # MDEV-7901: re-implement analyze table for low impact
+--echo # 
+
+create table t1 (a int, b int, c int, key IDX1(a), key IDX2(a,b)) engine=innodb;
+insert into t1 select seq/10, seq/2, seq from seq_0_to_9;
+
+
+SET DEBUG_SYNC='statistics_collection_start1 SIGNAL analyzing WAIT_FOR written';
+
+send analyze table t1 persistent for all;
+connect (con1, localhost, root,,);
+--connection con1
+
+SET DEBUG_SYNC= 'now WAIT_FOR analyzing';
+
+select count(*) from t1;
+# insert will work even with MyISAM because it allow to append file
+insert into t1 values (333,333,333);
+# but update now hang for MyISAM bacause can't get lock (InnoDB/XtraDB works)
+update t1 set a=1;
+
+SET DEBUG_SYNC= 'now SIGNAL written';
+
+--connection default
+--reap
+select count(*) from t1;
+
+set debug_sync='RESET';
+drop table t1;

mysql-test/t/stat_tables_myisam_debug.test

+--source include/have_sequence.inc
+--source include/have_stat_tables.inc
+--source include/have_debug_sync.inc
+--source include/not_embedded.inc
+
+--echo # 
+--echo # MDEV-7901: re-implement analyze table for low impact
+--echo # 
+
+create table t1 (a int, b int, c int, key IDX1(a), key IDX2(a,b)) engine=myisam;
+insert into t1 select seq/10, seq/2, seq from seq_0_to_9;
+
+
+SET DEBUG_SYNC='statistics_collection_start1 SIGNAL analyzing WAIT_FOR written';
+
+send analyze table t1 persistent for all;
+connect (con1, localhost, root,,);
+--connection con1
+
+SET DEBUG_SYNC= 'now WAIT_FOR analyzing';
+
+select count(*) from t1;
+# insert will work even with MyISAM because it allow to append file
+insert into t1 values (333,333,333);
+
+SET DEBUG_SYNC= 'now SIGNAL written';
+
+--connection default
+--reap
+select count(*) from t1;
+
+set debug_sync='RESET';
+drop table t1;

storage/innobase/handler/ha_innodb.cc

@@ -15502,6 +15502,7 @@ ha_innobase::store_lock(
 		/* Use consistent read for checksum table */
 
 		if (sql_command == SQLCOM_CHECKSUM
+                    || (sql_command == SQLCOM_ANALYZE && lock_type == TL_READ)
 		    || ((srv_locks_unsafe_for_binlog
 			|| trx->isolation_level <= TRX_ISO_READ_COMMITTED)
 			&& trx->isolation_level != TRX_ISO_SERIALIZABLE

storage/xtradb/handler/ha_innodb.cc

@@ -16247,7 +16247,7 @@ ha_innobase::store_lock(
 		/* Use consistent read for checksum table */
 
 		if (sql_command == SQLCOM_CHECKSUM
-		    || sql_command == SQLCOM_CHECKSUM
+                    || (sql_command == SQLCOM_ANALYZE && lock_type == TL_READ)
 		    || ((srv_locks_unsafe_for_binlog
 			|| trx->isolation_level <= TRX_ISO_READ_COMMITTED)
 			&& trx->isolation_level != TRX_ISO_SERIALIZABLE