MDEV-18122 Assertion 'table->versioned() == m_prebuilt->table->versioned()'...

MDEV-18122 Assertion 'table->versioned() == m_prebuilt->table->versioned()' failed in ha_innobase::open

Closes #1134

mysql-test/suite/versioning/r/online.result

@@ -143,5 +143,14 @@ create or replace table t1 (pk integer primary key, a int, b int, v int as (a))
 with system versioning;
 alter table t1 force;
 alter table t1 drop column b;
+#
+# MDEV-18122 Assertion `table->versioned() == m_prebuilt->table->versioned()' failed in ha_innobase::open
+#
+create or replace table t1 (
+x int,
+v int as (x) virtual,
+y int
+) with system versioning;
+alter table t1 drop system versioning;
 drop database test;
 create database test;

mysql-test/suite/versioning/t/online.test

@@ -182,6 +182,15 @@ with system versioning;
 alter table t1 force;
 alter table t1 drop column b;
 
+--echo #
+--echo # MDEV-18122 Assertion `table->versioned() == m_prebuilt->table->versioned()' failed in ha_innobase::open
+--echo #
+create or replace table t1 (
+  x int,
+  v int as (x) virtual,
+  y int
+) with system versioning;
+alter table t1 drop system versioning;
 
 drop database test;
 create database test;

storage/innobase/handler/handler0alter.cc

@@ -4234,7 +4234,8 @@ innobase_build_col_map(
 				}
 
 				col_map[old_i - num_old_v] = i;
-				if (old_table->versioned()) {
+				if (old_table->versioned()
+				    && altered_table->versioned()) {
 					if (old_i == old_table->vers_start) {
 						new_table->vers_start = i + num_v;
 					} else if (old_i == old_table->vers_end) {