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Posted to dev@calcite.apache.org by Chang Chen <ba...@gmail.com> on 2022/02/21 09:37:20 UTC

Support Left out join in RelMdExpressionLineage

Hi jesusca

I am investigating how to extend MaterializedViewRule to support left outer
join. The first issue which I met is supporting outer join in
RelMdExpressionLineage#getExpressionLineage()

I think the current implementation also fits in the outer join case, and to
support outer join only need to remove the codes which exclude the used
fields coming from the null supplying side.

Thanks
Chang.