BUG#31833 - ORDER BY leads to wrong result when ARCHIVE, BLOB and

            table cache is full

After reading last record from freshly opened archive table
(e.g. after flush table, or if there is no room in table cache),
the table is reported as crashed.

The problem was that azio wrongly invalidated azio_stream when it
meets EOF.

mysql-test/r/archive.result

@@ -12687,3 +12687,10 @@ CREATE TABLE t1(a VARCHAR(510)) ENGINE = ARCHIVE;
 INSERT INTO t1(a) VALUES ('');
 SELECT * FROM t1 ORDER BY a;
 DROP TABLE t1;
+CREATE TABLE t1(a INT NOT NULL AUTO_INCREMENT, b BLOB, KEY(a)) ENGINE=archive;
+INSERT INTO t1 VALUES (NULL, NULL),(NULL, NULL);
+FLUSH TABLE t1;
+SELECT * FROM t1 ORDER BY a;
+a	b
+1	NULL
+2	NULL

mysql-test/t/archive.test

@@ -1589,3 +1589,12 @@ SELECT * FROM t1 ORDER BY a;
 --enable_result_log
 
 DROP TABLE t1;
+
+#
+# BUG#31833 -  ORDER BY leads to wrong result when ARCHIVE, BLOB and table
+#              cache is full
+#
+CREATE TABLE t1(a INT NOT NULL AUTO_INCREMENT, b BLOB, KEY(a)) ENGINE=archive;
+INSERT INTO t1 VALUES (NULL, NULL),(NULL, NULL);
+FLUSH TABLE t1;
+SELECT * FROM t1 ORDER BY a;

storage/archive/azio.c

@@ -262,7 +262,7 @@ void check_header(azio_stream *s)
     if (len) s->inbuf[0] = s->stream.next_in[0];
     errno = 0;
     len = (uInt)my_read(s->file, (uchar *)s->inbuf + len, AZ_BUFSIZE_READ >> len, MYF(0));
-    if (len == 0) s->z_err = Z_ERRNO;
+    if (len == (uInt)-1) s->z_err = Z_ERRNO;
     s->stream.avail_in += len;
     s->stream.next_in = s->inbuf;
     if (s->stream.avail_in < 2) {