Crash when comparing a ROW(...) expression involving a window function to a correlated row subquery

Summary

Crash when comparing a ROW(...) expression involving a window function to a correlated row subquery .

Affected version

• MariaDB 12.3.1 (reproduced on asan-debug build)

Steps to reproduce

1. Create table and data:

   DROP TABLE IF EXISTS t1;

   CREATE TABLE t1 (vkey INT, c5 INT);

   INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3);

1. Run:

   SELECT ROW(AVG(vkey) OVER (PARTITION BY vkey), 59) =

   (SELECT ta.vkey, 59

   FROM t1 ta

   JOIN t1 tb ON (ta.vkey = outer_t.c5)

   LIMIT 1)

   FROM t1 AS outer_t;

Actual result

ERROR 2026 (HY000): TLS/SSL error: unexpected eof while reading

Expected result

• No server crash.