MDEV-19352: Server crash in alloc_histograms_for_table_share upon query from information schema

To read histograms for a table, we should check if the allocation of statistics was done or not,
if not done we should not try to read histograms for such a table.

3 files changed, 57 insertions, 0 deletions

diff --git a/mysql-test/r/stat_tables.result b/mysql-test/r/stat_tables.result
index bd3e9ed7a40..0a53a5ae99d 100644
--- a/mysql-test/r/stat_tables.result
+++ b/mysql-test/r/stat_tables.result
@@ -692,5 +692,23 @@ DROP DATABASE dbt3_s001;
 delete from mysql.table_stats;
 delete from mysql.column_stats;
 delete from mysql.index_stats;
+#
+# MDEV-19352: Server crash in alloc_histograms_for_table_share upon query from information schema
+#
+use test;
+set @save_optimizer_use_condition_selectivity= @@optimizer_use_condition_selectivity;
+set @@optimizer_use_condition_selectivity= 4;
+set use_stat_tables='preferably';
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (b INT);
+CREATE VIEW v AS SELECT * FROM t1 JOIN t2;
+INSERT INTO t2 SELECT * FROM x;
+ERROR 42S02: Table 'test.x' doesn't exist
+select * from information_schema.tables where table_name='v';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIME	TABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT
+def	test	v	VIEW	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	VIEW
+drop table t1,t2;
+drop view v;
+set @@optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;
 set @save_optimizer_switch=@@optimizer_switch;
 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 579d19462e7..9a93b479664 100644
--- a/mysql-test/r/stat_tables_innodb.result
+++ b/mysql-test/r/stat_tables_innodb.result
@@ -719,6 +719,24 @@ DROP DATABASE dbt3_s001;
 delete from mysql.table_stats;
 delete from mysql.column_stats;
 delete from mysql.index_stats;
+#
+# MDEV-19352: Server crash in alloc_histograms_for_table_share upon query from information schema
+#
+use test;
+set @save_optimizer_use_condition_selectivity= @@optimizer_use_condition_selectivity;
+set @@optimizer_use_condition_selectivity= 4;
+set use_stat_tables='preferably';
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (b INT);
+CREATE VIEW v AS SELECT * FROM t1 JOIN t2;
+INSERT INTO t2 SELECT * FROM x;
+ERROR 42S02: Table 'test.x' doesn't exist
+select * from information_schema.tables where table_name='v';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	TABLE_TYPE	ENGINE	VERSION	ROW_FORMAT	TABLE_ROWS	AVG_ROW_LENGTH	DATA_LENGTH	MAX_DATA_LENGTH	INDEX_LENGTH	DATA_FREE	AUTO_INCREMENT	CREATE_TIME	UPDATE_TIME	CHECK_TIME	TABLE_COLLATION	CHECKSUM	CREATE_OPTIONS	TABLE_COMMENT
+def	test	v	VIEW	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	VIEW
+drop table t1,t2;
+drop view v;
+set @@optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;
 set @save_optimizer_switch=@@optimizer_switch;
 set use_stat_tables=@save_use_stat_tables;
 set optimizer_switch=@save_optimizer_switch_for_stat_tables_test;
diff --git a/mysql-test/t/stat_tables.test b/mysql-test/t/stat_tables.test
index 97f9f08569f..2727f8d8bb1 100644
--- a/mysql-test/t/stat_tables.test
+++ b/mysql-test/t/stat_tables.test
@@ -453,6 +453,27 @@ delete from mysql.table_stats;
 delete from mysql.column_stats;
 delete from mysql.index_stats;
 
+--echo #
+--echo # MDEV-19352: Server crash in alloc_histograms_for_table_share upon query from information schema
+--echo #
+
+use test;
+set @save_optimizer_use_condition_selectivity= @@optimizer_use_condition_selectivity;
+set @@optimizer_use_condition_selectivity= 4;
+set use_stat_tables='preferably';
+
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (b INT);
+CREATE VIEW v AS SELECT * FROM t1 JOIN t2;
+--error ER_NO_SUCH_TABLE
+INSERT INTO t2 SELECT * FROM x;
+
+select * from information_schema.tables where table_name='v';
+
+drop table t1,t2;
+drop view v;
+set @@optimizer_use_condition_selectivity= @save_optimizer_use_condition_selectivity;
+
 set @save_optimizer_switch=@@optimizer_switch;
 
 set use_stat_tables=@save_use_stat_tables;