MDEV-16760 CREATE OR REPLACE TABLE never updates statistical tables

If the command CREATE OR REPLACE TABLE really replaces a table then
it should remove all data on this table from all statistical tables.

4 files changed, 74 insertions, 0 deletions

diff --git a/mysql-test/r/stat_tables.result b/mysql-test/r/stat_tables.result
index e6b675060a5..c1457d5e91a 100644
--- a/mysql-test/r/stat_tables.result
+++ b/mysql-test/r/stat_tables.result
@@ -552,3 +552,28 @@ pk
 2
 DROP TABLE t1;
 set use_stat_tables=@save_use_stat_tables;
+#
+# MDEV-16760: CREATE OR REPLACE TABLE after ANALYZE TABLE
+#
+SET use_stat_tables= PREFERABLY;
+CREATE TABLE t1 (pk int PRIMARY KEY, c varchar(32));
+INSERT INTO t1 VALUES (1,'foo'),(2,'bar');
+ANALYZE TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Engine-independent statistics collected
+test.t1	analyze	status	OK
+SELECT * FROM t1;
+pk	c
+1	foo
+2	bar
+SELECT * FROM mysql.column_stats;
+db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency	hist_size	hist_type	histogram
+test	t1	pk	1	2	0.0000	4.0000	1.0000	0	NULL	NULL
+test	t1	c	bar	foo	0.0000	3.0000	1.0000	0	NULL	NULL
+CREATE OR REPLACE TABLE t1 (pk int PRIMARY KEY, a char(7));
+SELECT * FROM t1;
+pk	a
+SELECT * FROM mysql.column_stats;
+db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency	hist_size	hist_type	histogram
+DROP TABLE t1;
+set use_stat_tables=@save_use_stat_tables;
diff --git a/mysql-test/r/stat_tables_innodb.result b/mysql-test/r/stat_tables_innodb.result
index 04d73868cfb..2ac868e9341 100644
--- a/mysql-test/r/stat_tables_innodb.result
+++ b/mysql-test/r/stat_tables_innodb.result
@@ -579,5 +579,30 @@ pk
 2
 DROP TABLE t1;
 set use_stat_tables=@save_use_stat_tables;
+#
+# MDEV-16760: CREATE OR REPLACE TABLE after ANALYZE TABLE
+#
+SET use_stat_tables= PREFERABLY;
+CREATE TABLE t1 (pk int PRIMARY KEY, c varchar(32));
+INSERT INTO t1 VALUES (1,'foo'),(2,'bar');
+ANALYZE TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	Engine-independent statistics collected
+test.t1	analyze	status	OK
+SELECT * FROM t1;
+pk	c
+1	foo
+2	bar
+SELECT * FROM mysql.column_stats;
+db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency	hist_size	hist_type	histogram
+test	t1	pk	1	2	0.0000	4.0000	1.0000	0	NULL	NULL
+test	t1	c	bar	foo	0.0000	3.0000	1.0000	0	NULL	NULL
+CREATE OR REPLACE TABLE t1 (pk int PRIMARY KEY, a char(7));
+SELECT * FROM t1;
+pk	a
+SELECT * FROM mysql.column_stats;
+db_name	table_name	column_name	min_value	max_value	nulls_ratio	avg_length	avg_frequency	hist_size	hist_type	histogram
+DROP TABLE t1;
+set use_stat_tables=@save_use_stat_tables;
 set optimizer_switch=@save_optimizer_switch_for_stat_tables_test;
 SET SESSION STORAGE_ENGINE=DEFAULT;
diff --git a/mysql-test/t/stat_tables.test b/mysql-test/t/stat_tables.test
index 843e6f8aa0b..d69b00618ea 100644
--- a/mysql-test/t/stat_tables.test
+++ b/mysql-test/t/stat_tables.test
@@ -336,3 +336,23 @@ SELECT pk FROM t1;
 DROP TABLE t1;
 
 set use_stat_tables=@save_use_stat_tables;
+
+--echo #
+--echo # MDEV-16760: CREATE OR REPLACE TABLE after ANALYZE TABLE
+--echo #
+
+SET use_stat_tables= PREFERABLY;
+
+CREATE TABLE t1 (pk int PRIMARY KEY, c varchar(32));
+INSERT INTO t1 VALUES (1,'foo'),(2,'bar');
+ANALYZE TABLE t1;
+SELECT * FROM t1;
+SELECT * FROM mysql.column_stats;
+
+CREATE OR REPLACE TABLE t1 (pk int PRIMARY KEY, a char(7));
+SELECT * FROM t1;
+SELECT * FROM mysql.column_stats;
+
+DROP TABLE t1;
+
+set use_stat_tables=@save_use_stat_tables;
diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index 6c71067d51b..ee02b5fc7aa 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -4762,6 +4762,10 @@ int create_table_impl(THD *thd,
     {
       if (create_info->options & HA_LEX_CREATE_REPLACE)
       {
+        LEX_STRING db_name= {(char *) db, strlen(db)};
+        LEX_STRING tab_name= {(char *) table_name, strlen(table_name)};
+        (void) delete_statistics_for_table(thd, &db_name, &tab_name);
+
         TABLE_LIST table_list;
         table_list.init_one_table(db, strlen(db), table_name,
                                   strlen(table_name), table_name,