Yang Jiang

from the log coverage success but fail at push result ``` || ballista-cli/src/main.rs: 1/45 || benchmarks/src/bin/nyctaxi.rs: 0/61 || benchmarks/src/bin/tpch.rs: 219/639 || examples/src/bin/dataframe.rs: 1/14 || examples/src/bin/sql.rs: 1/15 || python/src/pyarrow_filter_expression.rs: 0/14 ||...

in report coverage ``` Run bash git version 2.37.3 found ==> curl 7.68.0 (x86_6[4](https://github.com/apache/arrow-ballista/actions/runs/3026474487/jobs/4869894128#step:7:5)-pc-linux-gnu) libcurl/7.68.0 OpenSSL/1.1.1f zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.21.0 (+libidn2/2.2.0) libssh/0.9.3/openssl/zlib nghttp2/1.40.0 librtmp/2.3 Release-Date: 2020-01-08 Protocols: dict file ftp...

@alamb @thinkharderdev @doki23 i met the same problem in #2343 if we treat it as a `Expr` , we need change it to `PhysicalExpr` but ``` rust /// Evaluate an...

@tustvold may i ask you how to write a tmp parquet file, IMHP i think all parquet data file should end .parquet.

@alamb Do you think this is a reasonable change ?

In my mind `RowSelection` is a file-level struct and i think there could be multi-files in one parquetExec so `ParquetSelection` should be `multi-files-level` right? ----- btw if user customized index...

@hit-lacus PTAL 😊

@hit-lacus need any other process for this pr, this feature not effects any.

i am going to fix this `window func` issue. So we can do `window func` in ballista ✌️

I have run some query success in out internal version ballista 😄 and fix some issues.