mildbyte opened a new issue, #14633:
URL: https://github.com/apache/datafusion/issues/14633
### Describe the bug
Running this query:
```
SELECT
c1,
SUM(c2) FILTER (WHERE c2 >= 20) AS sum_c2,
AVG(c3) FILTER (WHERE c3 <= 70) AS avg_c3
FROM test_table GROUP BY c1
```
causes a parser error:
```
SQL(ParserError("Expected end of statement, found: ("), None)
```
### To Reproduce
Repro repo with a lockfile is available on
https://github.com/mildbyte/datafusion-agg-filter-repro:
```
use datafusion::prelude::{SessionConfig, SessionContext};
#[tokio::main]
async fn main() {
let sql = "SELECT
c1,
SUM(c2) FILTER (WHERE c2 >= 20) AS sum_c2,
AVG(c3) FILTER (WHERE c3 <= 70) AS avg_c3
FROM test_table GROUP BY c1";
let config = SessionConfig::new();
let context = SessionContext::new_with_config(config);
let stream = context.sql(sql).await.unwrap();
}
```
```
cargo run
...
warning: `datafusion-agg-filter-repro` (bin "datafusion-agg-filter-repro")
generated 1 warning
Finished `dev` profile [unoptimized + debuginfo] target(s) in 1m 01s
Running `target/debug/datafusion-agg-filter-repro`
thread 'main' panicked at src/main.rs:12:41:
called `Result::unwrap()` on an `Err` value: SQL(ParserError("Expected end
of statement, found: ("), None)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
### Expected behavior
Since I didn't create the tables, I don't expect the query to actually run,
but I would expect it to get to the plan phase and error then instead of
erroring in the parser.
This test case is already covered in DF:
https://github.com/apache/datafusion/blame/980931c5a70b8b08c918195803145f64f1ec901f/datafusion/sqllogictest/test_files/aggregate.slt#L4770-L4778
### Additional context
```
rustc 1.86.0-nightly (9a1d156f3 2025-01-19)
datafusion 45.0.0
sqlparser 0.53.0
```
This is the AST that's output by DF's parser (though I'm using 0.52.0 in
this example). It looks like with the default dialect, it treats `SUM(c2)
FILTER` as `FILTER` being an alias for `SUM(c2)`, then it considers the query
to be over:
<details>
```
Statement(
Query(
Query {
with: None,
body: Select(
Select {
select_token: TokenWithSpan {
token: Word(
Word {
value: "SELECT",
quote_style: None,
keyword: SELECT,
},
),
span: Span(Location(0,0)..Location(0,0)),
},
distinct: None,
top: None,
top_before_distinct: false,
projection: [
UnnamedExpr(
Identifier(
Ident {
value: "c1",
quote_style: None,
span: Span(Location(0,0)..Location(0,0)),
},
),
),
ExprWithAlias {
expr: Function(
Function {
name: ObjectName(
[
Ident {
value: "SUM",
quote_style: None,
span:
Span(Location(0,0)..Location(0,0)),
},
],
),
uses_odbc_syntax: false,
parameters: None,
args: List(
FunctionArgumentList {
duplicate_treatment: None,
args: [
Unnamed(
Expr(
Identifier(
Ident {
value: "c2",
quote_style:
None,
span:
Span(Location(0,0)..Location(0,0)),
},
),
),
),
],
clauses: [],
},
),
filter: None,
null_treatment: None,
over: None,
within_group: [],
},
),
alias: Ident {
value: "FILTER",
quote_style: None,
span: Span(Location(0,0)..Location(0,0)),
},
},
],
into: None,
from: [],
lateral_views: [],
prewhere: None,
selection: None,
group_by: Expressions(
[],
[],
),
cluster_by: [],
distribute_by: [],
sort_by: [],
having: None,
named_window: [],
qualify: None,
window_before_qualify: false,
value_table_mode: None,
connect_by: None,
},
),
order_by: None,
limit: None,
limit_by: [],
offset: None,
fetch: None,
locks: [],
for_clause: None,
settings: None,
format_clause: None,
},
),
)
```
</details>
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