Rust

Implement user defined planner for position #3

Job	Run time
cargo check	8m 6s
Check cargo fmt	41s
build with wasm-pack	2m 19s
cargo test (macos)	6m 4s
cargo test (macos-aarch64)	6m 5s
Verify MSRV (Min Supported Rust Version)	6m 34s
Verify Vendored Code	53s
cargo test (win64)	24m 35s
cargo test (amd64)	9m 14s
cargo examples (amd64)	2m 31s
cargo doc	3m 30s
cargo test datafusion-cli (amd64)	3m 34s
cargo test doc (amd64)	12m 21s
verify benchmark results (amd64)	10m 41s
check Cargo.toml formatting	2m 48s
clippy	4m 56s
check configs.md is up-to-date	2m 43s
cargo test hash collisions (amd64)	8m 57s
Run sqllogictest with Postgres runner	3m 29s
cargo test pyarrow (amd64)	2m 34s
	2h 2m 35s

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