AssHero opened a new pull request, #2750:
URL: https://github.com/apache/arrow-datafusion/pull/2750
# Rationale for this change
try to reduce left/right/full join to inner join
for query: select ... from a left join b on ... where b.xx = 100;
if b.xx is null, and b.xx = 100 returns false, filterd those null rows.
Therefore, there is no need to produce null rows for output, we can use
inner join instead of left join.
Generally, right join/full join can also be reduced to inner join according
to these rules.
# What changes are included in this PR?
add reduce_outer_plan to try to reduce left/right/full join to inner join in
src/planner.rs
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