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Andy GroveJorge C. Leitao
eb17687510e
Andy Grove authored and Jorge C. Leitao committed 399245678c1
ARROW-11029: [Rust] [DataFusion] Add documentation for code that determines number of rows per operator

Recurse down the plan when looking for number of rows when optimizing join order, so that we get the optimization even when the table scan is wrapped in a filter.

Without this change, TPC-H q12 has the larger lineitem table on the left.

Closes #9007 from andygrove/fix-join-optimization

Authored-by: Andy Grove <andygrove73@gmail.com>
Signed-off-by: Jorge C. Leitao <jorgecarleitao@gmail.com>