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convergence是rust编写支持postgresql协议的工具包。

它的convergence/convergence-arrow/examples/datafusion.rs是一个支持datafusion后台数据引擎DeepSeek的简易服务器示例程序。

通过询问DeepSeek，我知道了怎么运行这个示例。
Rust 项目中的 examples 目录通常用于存放示例代码，这些示例展示了如何使用你这个库（在这里是 convergence-arrow）的功能。

可以在这个项目下的任何目录中运行cargo run --example datafusion, Cargo 会自动识别。但是因为它又依赖一个csv文件，所以还是要在正确的目录下执行，否则会报文件不存在的错误。

/par/convergence/convergence-arrow# cargo run --example datafusionCompiling convergence-arrow v0.17.1 (/par/convergence/convergence-arrow)Finished `dev` profile [unoptimized + debuginfo] target(s) in 56.39sRunning `/par/convergence/target/debug/examples/datafusion`thread 'tokio-runtime-worker' panicked at convergence-arrow/examples/datafusion.rs:33:6:
failed to register csv: ObjectStore(NotFound { path: "/par/convergence/convergence-arrow/convergence-arrow/data/100_4buckets.csv", source: Os { code: 2, kind: NotFound, message: "No such file or directory" } })
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

改到上一级目录执行，就不报错了。

/par/convergence/convergence-arrow# cd ..
/par/convergence# cargo run --example datafusionFinished `dev` profile [unoptimized + debuginfo] target(s) in 3.44sRunning `target/debug/examples/datafusion`thread 'tokio-runtime-worker' panicked at /par/convergence/convergence/src/server.rs:52:27:
called `Result::unwrap()` on an `Err` value: ConnectionClosed
note: run with `RUST_BACKTRACE=1` environment variable to display a backtracethread 'tokio-runtime-worker' panicked at /par/convergence/convergence/src/server.rs:52:27:
called `Result::unwrap()` on an `Err` value: ConnectionClosedthread 'tokio-runtime-worker' panicked at /par/convergence/convergence/src/server.rs:52:27:
called `Result::unwrap()` on an `Err` value: ConnectionClosed

另开一个终端，沿用我们的postgresql协议客户端工具pgproto，一开始脚本中的表不存在就报错，后来改成查询示例中注册的test_100_4buckets表（其实是datafusion访问data/100_4buckets.csv文件），就能查询出结果了。

/par/pgproto/src# ./pgproto -h 127.0.0.1 -p 5432 -f /par/pgpo2.txt
Failed to connect to host=127.0.0.1 port=5432.
/par/pgproto/src# ./pgproto -h 127.0.0.1 -p 5432 -f /par/pgpo2.txt
FE=> Query (query="SELECT * FROM foods where category='meat' limit 2")
<= BE ErrorResponse(C 22000 S ERROR M Error during planning: table 'datafusion.public.foods' not found )
<= BE ReadyForQuery(I)/par/pgproto/src# ./pgproto -h 127.0.0.1 -p 5432 -f /par/pgpo3.txt
FE=> Query (query="select count(*) from test_100_4buckets")
<= BE RowDescription
解析出的字段名:
字段数量: 1
字段 1: count(*)
<= BE DataRow
100
<= BE CommandComplete(SELECT 1)
<= BE ReadyForQuery(I)
FE=> Query (query="select bucket, count(*) from test_100_4buckets group by bucket order by bucket")
<= BE RowDescription
解析出的字段名:
字段数量: 2
字段 1: bucket
字段 2: count(*)
<= BE DataRow
a|25
<= BE DataRow
b|25
<= BE DataRow
c|25
<= BE DataRow
d|25
<= BE CommandComplete(SELECT 4)
<= BE ReadyForQuery(I)

除了运行example, 还可以运行test, 可以test一个文件，

cargo test --test test_datafusionCompiling convergence-arrow v0.17.1 (/par/convergence/convergence-arrow)Finished `test` profile [unoptimized + debuginfo] target(s) in 2m 34sRunning tests/test_datafusion.rs (target/debug/deps/test_datafusion-5bfe2727a2979e23)running 2 tests
test count_rows ... ok
test grouped_counts ... ok

也可以test一个函数, cargo会自动在各个文件中找这个函数。

/par/convergence# cargo test count_rowsCompiling convergence-arrow v0.17.1 (/par/convergence/convergence-arrow)Finished `test` profile [unoptimized + debuginfo] target(s) in 2m 12sRunning unittests src/lib.rs (target/debug/deps/convergence-59c3fb083bdbbb67)running 0 teststest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00sRunning tests/test_connection.rs (target/debug/deps/test_connection-96a75e35b0056308)running 0 teststest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 6 filtered out; finished in 0.00sRunning unittests src/lib.rs (target/debug/deps/convergence_arrow-a62e8f28e1b474cd)running 0 teststest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00sRunning tests/test_arrow.rs (target/debug/deps/test_arrow-cfca8d83e13540b8)running 0 teststest result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.00sRunning tests/test_datafusion.rs (target/debug/deps/test_datafusion-5bfe2727a2979e23)running 1 test
test count_rows ... oktest result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 1 filtered out; finished in 1.73s

这个工具包的功能还不完善，create table语句就不能成功，统一返回一个表已存在的错误

/par/pgproto/src# ./pgproto -h 127.0.0.1 -p 5432 -f /par/pgpo4.txt
FE=> Query (query="create table test(i int, j varchar(10))")
<= BE ErrorResponse(C 22000 S ERROR M Execution error: Table 'test' already exists )
<= BE ReadyForQuery(I)
FE=> Query (query="create table test1(i int, j varchar(10))")
<= BE ErrorResponse(C 22000 S ERROR M Execution error: Table 'test1' already exists )
<= BE ReadyForQuery(I)