leanken commented on pull request #29104:
URL: https://github.com/apache/spark/pull/29104#issuecomment-659125973
For example.
-- Case 4
-- (one column null, other column matches a row in the subquery result ->
row not returned)
SELECT *
FROM m
WHERE b = 1.0 -- Matches (null, 1.0)
AND (a, b) NOT IN (SELECT *
FROM s
WHERE c IS NOT NULL) -- Matches (0, 1.0), (2,
3.0), (4, null)
;
in this case, i can't not use InternalRow(null, 1.0) to lookup in
HashedRelation. I need to exclude all null column, and try found match within
the not null column, which i think HashedRelation is not a suitable structure
for multi-column support. But if change into multi column and need to deal with
null column, which means i can't use Hash to lookup, so it will still be a
M\*N, that's no gona help.
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