jon-chuang commented on code in PR #2451:
URL: https://github.com/apache/arrow-datafusion/pull/2451#discussion_r865690206
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datafusion/core/src/optimizer/subquery_filter_to_join.rs:
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@@ -348,11 +556,36 @@ mod tests {
let expected = "Projection: #test.b [b:UInt32]\
\n Semi Join: #test.b = #sq.a [a:UInt32, b:UInt32, c:UInt32]\
\n TableScan: test projection=None [a:UInt32, b:UInt32, c:UInt32]\
- \n Projection: #sq.a [a:UInt32]\
- \n Semi Join: #sq.a = #sq_nested.c [a:UInt32, b:UInt32, c:UInt32]\
- \n TableScan: sq projection=None [a:UInt32, b:UInt32, c:UInt32]\
- \n Projection: #sq_nested.c [c:UInt32]\
- \n TableScan: sq_nested projection=None [a:UInt32, b:UInt32,
c:UInt32]";
+ \n Semi Join: #sq.a = #sq_nested.c [a:UInt32, b:UInt32, c:UInt32]\
Review Comment:
Note: this is a quirk of the implementation. It removes projections below
the semi join in some cases (which are inconsequential).
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