Mingliang Zhu

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@cloud-fan Can you help take a look if you have time? Thanks.

cc @cloud-fan @wankunde @ulysses-you do you have any thought about this? Thanks.

> I'm sorry where is smj_leftIndex_0 reset to 0 ? > > https://gist.github.com/zml1206/a27350b8849951e6efac0fb6088e527f#file-full_outer_sort_merge_join_codegen_after-L280-L305 https://gist.github.com/zml1206/a27350b8849951e6efac0fb6088e527f#file-full_outer_sort_merge_join_codegen_after-L126

Whenever `processNext` is called, the buffer will be consumed first, and then `findNextJoinRows` will be called to reset the index and buffer and match the new row written into the...

@beliefer If you have time, can you help me take a look? cc @cloud-fan

> Although I understood the mechanism, please add more detail in the PR description. So as other contributors could understand. Done