Dandandan opened a new pull request #238:
URL: https://github.com/apache/arrow-datafusion/pull/238
# Which issue does this PR close?
Closes #235
TODO: add test for left join with multiple batches.
# Rationale for this change
Fixes behavior of left join with regard to multiple batches on the right
side and 0 right side batches.
Also performance-wise likely is faster as it avoids keeping generating /
keeping / indexing into a hash set for each batch.
# What changes are included in this PR?
We add a `Vec<bool>` to keep track of left-side rows that didn't match with
the right side.
# Are there any user-facing changes?
Should be
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