The optimizer considers star join optimization when appropriate and decides on star join plan based on cost considerations in order to come up with best execution plan for a star join query.
为了实现星型连接查询的最佳执行计划，优化器在适当的时候会考虑星型连接优化，并根据成本因素来决定星型连接计划。
The invariablenes condition of circle girth of the join-line end of the main pipe was set up and the join-lines on Y-tee to be ellipse was made certain.
建立了圆柱分支管y型三通的主管相贯线处的周长不变的条件，确定了相贯线为椭圆。
The invariablenes condition of circle girth of the join-line end of the main pipe was set up and the join-lines on Y-tee to be ellipse was made certain.
建立了圆柱分支管y型三通的主管相贯线处的周长不变的条件，确定了相贯线为椭圆。
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