MDEV-30651: Assertion `sel->quick' in make_range_rowid_filters

(Variant for 10.6: return error code from SQL_SELECT::test_quick_select)
The optimizer deals with Rowid Filters this way:

1. First, range optimizer is invoked. It saves information
   about all potential range accesses.
2. A query plan is chosen. Suppose, it uses a Rowid Filter on
   index $IDX.
3. JOIN::make_range_rowid_filters() calls the range optimizer
again to create a quick select on index $IDX which will be used
to populate the rowid filter.

The problem: KILL command catches the query in step #3. Quick
Select is not created which causes a crash.

Fixed by checking if query was killed.

mysql-test/include/rowid_filter_debug_kill.inc

@@ -55,5 +55,33 @@ disconnect con1;
 reap;
 set debug_sync='RESET';
 
+--echo #
+--echo # MDEV-30651: SIGSEGV in st_join_table::save_explain_data and
+--echo #             Assertion `sel->quick' failed in make_range_rowid_filters
+--echo #
+
+--echo # Reusing table t2 and t3 from previous test
+let $target_id= `select connection_id()`;
+
+set debug_sync='in_forced_range_optimize SIGNAL ready1 WAIT_FOR go1';
+send
+explain
+select * from t2, t3
+where
+  t3.key1=t2.a and t3.key2 in (2,3);
+
+connect (con1, localhost, root,,);
+set debug_sync='now WAIT_FOR ready1';
+evalp kill query $target_id;
+set debug_sync='now SIGNAL go1';
+
+connection default;
+disconnect con1;
+
+--error ER_QUERY_INTERRUPTED
+reap;
+set debug_sync='RESET';
+
+
 drop table t2,t3;
 --source include/wait_until_count_sessions.inc

mysql-test/main/rowid_filter_innodb_debug.result

@@ -46,5 +46,23 @@ connection default;
 disconnect con1;
 ERROR 70100: Query execution was interrupted
 set debug_sync='RESET';
+#
+# MDEV-30651: SIGSEGV in st_join_table::save_explain_data and
+#             Assertion `sel->quick' failed in make_range_rowid_filters
+#
+# Reusing table t2 and t3 from previous test
+set debug_sync='in_forced_range_optimize SIGNAL ready1 WAIT_FOR go1';
+explain
+select * from t2, t3
+where
+t3.key1=t2.a and t3.key2 in (2,3);
+connect  con1, localhost, root,,;
+set debug_sync='now WAIT_FOR ready1';
+kill query $target_id;
+set debug_sync='now SIGNAL go1';
+connection default;
+disconnect con1;
+ERROR 70100: Query execution was interrupted
+set debug_sync='RESET';
 drop table t2,t3;
 set default_storage_engine=default;

mysql-test/main/rowid_filter_myisam_debug.result

@@ -45,4 +45,22 @@ connection default;
 disconnect con1;
 ERROR 70100: Query execution was interrupted
 set debug_sync='RESET';
+#
+# MDEV-30651: SIGSEGV in st_join_table::save_explain_data and
+#             Assertion `sel->quick' failed in make_range_rowid_filters
+#
+# Reusing table t2 and t3 from previous test
+set debug_sync='in_forced_range_optimize SIGNAL ready1 WAIT_FOR go1';
+explain
+select * from t2, t3
+where
+t3.key1=t2.a and t3.key2 in (2,3);
+connect  con1, localhost, root,,;
+set debug_sync='now WAIT_FOR ready1';
+kill query $target_id;
+set debug_sync='now SIGNAL go1';
+connection default;
+disconnect con1;
+ERROR 70100: Query execution was interrupted
+set debug_sync='RESET';
 drop table t2,t3;

sql/opt_range.cc

@@ -2720,7 +2720,10 @@ SQL_SELECT::test_quick_select(THD *thd,
     only_single_index_range_scan= 1;
 
   if (head->force_index || force_quick_range)
+  {
+    DEBUG_SYNC(thd, "in_forced_range_optimize");
     scan_time= read_time= DBL_MAX;
+  }
   else
   {
     scan_time= rows2double(records) / TIME_FOR_COMPARE;
@@ -3117,6 +3120,12 @@ SQL_SELECT::test_quick_select(THD *thd,
     free_root(&alloc,MYF(0));			// Return memory & allocator
     thd->mem_root= param.old_root;
     thd->no_errors=0;
+    if (thd->killed || thd->is_error())
+    {
+      delete quick;
+      quick= NULL;
+      returnval= ERROR;
+    }
   }
 
   DBUG_EXECUTE("info", print_quick(quick, &needed_reg););

sql/sql_select.cc

@@ -1987,6 +1987,7 @@ bool JOIN::make_range_rowid_filters()
     tab->table->force_index= force_index_save;
     if (rc == SQL_SELECT::ERROR || thd->is_error())
     {
+      delete sel;
       DBUG_RETURN(true); /* Fatal error */
     }
     /*
@@ -2012,8 +2013,6 @@ bool JOIN::make_range_rowid_filters()
         continue;
     }
   no_filter:
-    if (sel->quick)
-      delete sel->quick;
     delete sel;
   }
 
@@ -2031,7 +2030,9 @@ bool JOIN::make_range_rowid_filters()
     rowid container employed by the filter. On success it lets the table engine
     know that what rowid filter will be used when accessing the table rows.
 
-  @retval false  always
+  @retval
+    false OK
+    true  Error, query should abort
 */
 
 bool