In #16343, we split the timeout variable into two ones (one is for query and another is for insertion).
The function `ConnectProcessor::handleQuery` uses the corresponding session variable to change the timeout for the queries requested by MySQL client. However, the function `StmtExecutor::handleInsert` doesn't use the session variable to change the timeout, so we can't change the timeout for the CTAS and MTMV insertion job.
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