waitingkuo commented on issue #2867:
URL:
https://github.com/apache/arrow-datafusion/issues/2867#issuecomment-1179784547
i tried it on sqlparser-rs, it doesn't work
``` rust
use sqlparser::dialect::GenericDialect;
use sqlparser::parser::Parser;
fn main() {
let dialect = GenericDialect {}; // or AnsiDialect
let sql = "SELECT __t404.__c394, __t404.__c395, __t404.__c396,
__t404.__c397
FROM ((
(SELECT test1.c0 AS __c394, test1.c1 AS __c395, test1.c2
AS __c396, test1.c3 AS __c397
FROM (test1)) __t398
INNER JOIN
(SELECT test1.c0 AS __c399, test1.c1 AS __c400, test1.c2
AS __c401, test1.c3 AS __c402
FROM (test1)) __t403
ON __t398.__c395 = __t403.__c401) __t404)
WHERE __t404.__c395 != __t404.__c396; ";
let ast = Parser::parse_sql(&dialect, sql).unwrap();
println!("AST: {:?}", ast);
}
```
``` bash
➜ sp git:(master) ✗ cargo run
Compiling sp v0.1.0 (/Users/willy/willy/df-workspace/sp)
Finished dev [unoptimized + debuginfo] target(s) in 0.30s
Running `target/debug/sp`
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value:
ParserError("Expected ), found: __t404")', src/main.rs:26:48
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
looks like the outer alias doesn't work. the following sql works
``` SQL
❯ SELECT __c394, __c395, __c396, __c397
FROM ((
(SELECT test1.c0 AS __c394, test1.c1 AS __c395, test1.c2 AS __c396,
test1.c3 AS __c397
FROM (test1)) __t398
INNER JOIN
(SELECT test1.c0 AS __c399, test1.c1 AS __c400, test1.c2 AS __c401,
test1.c3 AS __c402
FROM (test1)) __t403
ON __t398.__c395 = __t403.__c401) )
WHERE __c395 != __c396;
0 rows in set. Query took 0.004 seconds.
```
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