Browse mode is invalid for subqueries and derived tables.

对于子查询和派生表,浏览模式无效.

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Consider for example subqueries - each layer may need its own read _ buffer, sort _ buffer, tmp _ table _ size etc.

考虑到例如子查询 -- 每层都需要有自己的read_buffer, sort_buffer, tmp_table_size等.

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