MDEV-24529 Assertion failed in vers_select_conds_t::print

This commit adds processing of SYSTEM_TIME_BEFORE and SYSTEM_TIME_HISTORY
to vers_select_conds_t::print().

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

@@ -187,3 +187,15 @@ x
 1
 drop prepare stmt;
 drop table t1;
+#
+# MDEV-28201 Server crashes upon SHOW ANALYZE/EXPLAIN FORMAT=JSON
+#
+CREATE TABLE t1 (a INT) WITH SYSTEM VERSIONING;
+CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
+SET optimizer_trace= 'enabled=on';
+DELETE HISTORY FROM v1 BEFORE SYSTEM_TIME '2021-01-01';
+ERROR HY000: The target table v1 of the DELETE is not updatable
+DELETE HISTORY FROM v1;
+ERROR HY000: The target table v1 of the DELETE is not updatable
+DROP VIEW v1;
+DROP TABLE t1;

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

@@ -192,4 +192,17 @@ select * from t1;
 drop prepare stmt;
 drop table t1;
 
+--echo #
+--echo # MDEV-28201 Server crashes upon SHOW ANALYZE/EXPLAIN FORMAT=JSON
+--echo #
+CREATE TABLE t1 (a INT) WITH SYSTEM VERSIONING;
+CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t1;
+SET optimizer_trace= 'enabled=on';
+--error ER_NON_UPDATABLE_TABLE
+DELETE HISTORY FROM v1 BEFORE SYSTEM_TIME '2021-01-01';
+--error ER_NON_UPDATABLE_TABLE
+DELETE HISTORY FROM v1;
+DROP VIEW v1;
+DROP TABLE t1;
+
 --source suite/versioning/common_finish.inc

sql/sql_select.cc

@@ -790,8 +790,10 @@ void vers_select_conds_t::print(String *str, enum_query_type query_type) const
     end.print(str, query_type, STRING_WITH_LEN(" AND "));
     break;
   case SYSTEM_TIME_BEFORE:
+    start.print(str, query_type, STRING_WITH_LEN(" FOR SYSTEM_TIME BEFORE "));
+    break;
   case SYSTEM_TIME_HISTORY:
-    DBUG_ASSERT(0);
+    // nothing to add
     break;
   case SYSTEM_TIME_ALL:
     str->append(" FOR SYSTEM_TIME ALL");