executor: refactor joinResultGenerator
to handle the unmatched outer records (#7288)
#7315
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What have you changed? (mandatory)
cherrypick #7288 to release-2.0
What is the type of the changes? (mandatory)
How has this PR been tested? (mandatory)
Does this PR affect documentation (docs/docs-cn) update? (mandatory)
No
Does this PR affect tidb-ansible update? (mandatory)
No
Does this PR need to be added to the release notes? (mandatory)