On Tue, Jun 16, 2015 at 8:57 AM, Tiankun Hu <tiankun...@foxmail.com> wrote:
> Hi, > After go through the block_executor.cc, I found alignment feature work > only when output_multiple not set, why them can not work at the same time? > > -- > Thanks > Tiankun > Because they are competing objectives. The alignment tries to keep buffers aligned and therefore the number of items will be based on a multiple of the alignment requirement. If you need an output multiple that's different than that, which one should the scheduler choose? Note that the buffers always begin on a page and so are inherently aligned. If your output multiple is also a multiple of the alignment for the data type, then you'll always be aligned. Tom
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