alamb commented on code in PR #4276:
URL: https://github.com/apache/arrow-datafusion/pull/4276#discussion_r1026854991
##########
datafusion/optimizer/src/limit_push_down.rs:
##########
@@ -635,13 +481,8 @@ mod test {
.limit(0, Some(10))?
.build()?;
- // Should push down the smallest limit
- // Towards table scan
- // This rule doesn't replace multiple limits
- let expected = "Limit: skip=0, fetch=10\
- \n Limit: skip=0, fetch=10\
- \n Limit: skip=10, fetch=10\
- \n TableScan: test, fetch=20";
+ let expected = "Limit: skip=10, fetch=10\
Review Comment:
Those plans look much nicer
##########
datafusion/optimizer/src/limit_push_down.rs:
##########
@@ -576,8 +424,8 @@ mod test {
// Should push the limit down to table provider
// When it has a select
- let expected = "Limit: skip=10, fetch=1000\
- \n Projection: test.a\
+ let expected = "Projection: test.a\
+ \n Limit: skip=10, fetch=1000\
\n TableScan: test, fetch=1010";
Review Comment:
https://github.com/apache/arrow-datafusion/blob/8c02485cfc3d2c48bc48a557db58e3e5a0f75777/datafusion/core/src/datasource/datasource.rs#L66-L70
Implies that in fact we still need the `Limit` node even when it has been
pushed to the scan as well
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