mysqltest case wf_pby_mysql_oracle_sqlqa.wf_pby_multitable_mysql triggers disconnection/process crash with parallel PX + DISTINCT + AVG OVER(PARTITION BY other table column) + LEFT JOIN on Windows

[chyujing]

Description

A specific mysqltest case (wf_pby_mysql_oracle_sqlqa.wf_pby_multitable_mysql) triggers a disconnection or process crash when executing a query that combines parallel execution (PX), DISTINCT, a window function AVG OVER(PARTITION BY a column from another table), and a LEFT JOIN.

Steps to Reproduce

The reproduction steps involve accessing a specific directory on the machine: /obdata/data/AndroidTest/ob_opensource_test/tool...