JerAguilon commented on code in PR #41874:
URL: https://github.com/apache/arrow/pull/41874#discussion_r1619106973
##########
cpp/src/arrow/acero/asof_join_node.cc:
##########
@@ -912,7 +912,12 @@ class CompositeTableBuilder {
}
}
}
- return CompositeTable{schema, inputs.size(), dst_to_src, pool};
+ // NB: The left hand side of the join (index 0) is the reference table of
the
+ // asof-join. The output is comprised of continuous slices of the this
table, so
+ // we can just take zero-copy slices of it. This is much faster than how
other
+ // tables are treated, wherein we need to copy
+ return CompositeTable{schema, inputs.size(), dst_to_src, pool,
+ /*contiguous_sources=*/{0}};
Review Comment:
To aid review as this branch is rebased on top of
https://github.com/apache/arrow/pull/41125
This line is changed by this PR.
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