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support stream aggregation in the new plan and clean the tests.
executor: remove useless test
Merge branch 'master' into zimuxia/stream-agg
plan: make go vet happy
plan: remove the useless log
add test for stream agg + index join and stream agg + merge join and stream agg + limit and stream agg + sort
Add test for this case.
Why not use index on e for filtering or use index on b for streaming aggregation?
using index will cause a double read.
plan: add tests
plan: tiny update
plan: add the desc test
the case that t.b <= 30 and t.b <= 40 is not necessary?
t.b <= 30
t.b <= 40
There are old tests. @hanfei1991