How do I use $crossjoin in OData?

established the OData API of the corresponding single entity
want to associate multiple tables

follow the official tutorial

http://host/service/$crossjoin(Products,Sales)?$filter=Products/ID eq Sales/ProductID  

write url to visit, and you get 404

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Mar.09,2021

NOT SUPPORTED FEATURES

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e43f19-44a6e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e43f19-44a6e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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