Produce informative error message on insert plan type mismatch #250

Job	Run time
Check cargo fmt	37s
build with wasm-pack	2m 42s
cargo test (macos)	9m 44s
cargo check	10m 42s
cargo test (macos-aarch64)	10m 14s
Verify MSRV (Min Supported Rust Version)	7m 15s
Verify Vendored Code	48s
cargo test (win64)	48m 28s
cargo test (amd64)	10m 24s
cargo examples (amd64)	13m 13s
clippy	5m 38s
cargo doc	3m 51s
cargo test datafusion-cli (amd64)	4m 3s
Run sqllogictest with Postgres runner	3m 32s
cargo test pyarrow (amd64)	2m 51s
verify benchmark results (amd64)	12m 38s
check Cargo.toml formatting	3m 5s
check configs.md is up-to-date	2m 58s
cargo test hash collisions (amd64)	14m 45s
cargo test doc (amd64)	14m 53s
	3h 2m 21s

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