Fix for BUG#31148: bool close_thread_table(THD*, TABLE**):

Assertion `table->key_read == 0' failed.

The problem was that key_read on a table in a sub-select was not
properly reset. That happens because the code responsible for that
is copy&pasted all around the server. In some place, it was obviously
forgotten to be pasted.

The fix is to reset key_read properly.

mysql-test/r/key.result

@@ -530,3 +530,18 @@ ORDER BY c.b, c.d
 a	b	c	d	e	f	g	h	i	j	a	b	c	d
 2	2	1	2004-11-30 12:00:00	1	0	0	0	0	0	2	3388000	-553000	NULL
 DROP TABLE t1, t2;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT);
+INSERT INTO t1 VALUES (), (), ();
+SELECT 1 AS c1
+FROM t1
+ORDER BY (
+SELECT 1 AS c2
+FROM t1
+GROUP BY GREATEST(LAST_INSERT_ID(), t1.a) ASC
+LIMIT 1);
+c1
+1
+1
+1
+DROP TABLE t1;

mysql-test/t/key.test

@@ -501,3 +501,26 @@ ORDER BY c.b, c.d
 ;
 
 DROP TABLE t1, t2;
+
+#
+# Bug #31148: bool close_thread_table(THD*, TABLE**): Assertion
+# `table->key_read == 0' failed.
+#
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT);
+
+INSERT INTO t1 VALUES (), (), ();
+
+SELECT 1 AS c1
+FROM t1
+ORDER BY (
+  SELECT 1 AS c2
+  FROM t1
+  GROUP BY GREATEST(LAST_INSERT_ID(), t1.a) ASC
+  LIMIT 1);
+
+DROP TABLE t1;

sql/sql_select.cc

@@ -6651,10 +6651,17 @@ void JOIN::cleanup(bool full)
       for (tab= join_tab, end= tab+tables; tab != end; tab++)
       {
 	if (tab->table)
+        {
+          if (tab->table->key_read)
+          {
+            tab->table->key_read= 0;
+            tab->table->file->extra(HA_EXTRA_NO_KEYREAD);
+          }
           tab->table->file->ha_index_or_rnd_end();
         }
       }
     }
+  }
   /*
     We are not using tables anymore
     Unlock all tables. We may be in an INSERT .... SELECT statement.