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Support parsing empty map literal syntax for DuckDB and Genric #1361

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Merged
merged 5 commits into from
Aug 4, 2024
Merged

Support parsing empty map literal syntax for DuckDB and Genric #1361

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21cdef3
support parsing empty map literal syntax
goldmedal Aug 2, 2024
0763f52
extract parse_comma_separated0
goldmedal Aug 3, 2024
5d81654
use parse_comma_separated0 for parsing array and map elements
goldmedal Aug 3, 2024
4479ecd
fix the doc
goldmedal Aug 3, 2024
239ef53
roll back trailing_commas
goldmedal Aug 4, 2024
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14 changes: 8 additions & 6 deletions src/parser/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2352,12 +2352,14 @@ impl<'a> Parser<'a> {
/// [map]: https://duckdb.org/docs/sql/data_types/map.html#creating-maps
fn parse_duckdb_map_literal(&mut self) -> Result<Expr, ParserError> {
self.expect_token(&Token::LBrace)?;

let fields = self.parse_comma_separated(Self::parse_duckdb_map_field)?;

self.expect_token(&Token::RBrace)?;

Ok(Expr::Map(Map { entries: fields }))
if self.peek_token().token == Token::RBrace {
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is it possible to switch to let fields = self.parse_comma_separated0(Self::parse_duckdb_map_field)?; instead? if so that would let us skip the if/else here

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I don't think we can do it. It seems that parse_comma_separated0 is for parentheses, but MAP uses braces.
https://github.com/sqlparser-rs/sqlparser-rs/blob/d49acc67b13e1d68f2e6a25546161a68e165da4f/src/parser/mod.rs#L3487

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Ah i see, I'm thinking we could still reuse the logic (thinking its currently a bit odd that parse_comma_separated0 is hardcoded to parenthesis while parse_comma_separated is token agnostic as it should be). Seems there's ony a couple of usages of parse_comma_separated0, we could change it to something like parse_comma_separated0(|| {}, Token::RParen)?

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I addressed this in 0763f52 and 5d81654. I share the same logic for brace, parenthesis, and bracket. I think it looks better. Thanks.

let _ = self.next_token(); // consume }
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Nit: ambiguous comments

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I followed the same style as parsing the array literal. Should I enhance them?
https://github.com/sqlparser-rs/sqlparser-rs/blob/d49acc67b13e1d68f2e6a25546161a68e165da4f/src/parser/mod.rs#L1853

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My bad, i interpreted wrongly. This look good.

Ok(Expr::Map(Map { entries: vec![] }))
} else {
let fields = self.parse_comma_separated(Self::parse_duckdb_map_field)?;
self.expect_token(&Token::RBrace)?;
Ok(Expr::Map(Map { entries: fields }))
}
}

/// Parse a field for a duckdb [map]
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2 changes: 2 additions & 0 deletions tests/sqlparser_common.rs
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Expand Up @@ -10282,6 +10282,8 @@ fn test_map_syntax() {
}),
},
);

check("MAP {}", Expr::Map(Map { entries: vec![] }));
}

#[test]
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