feat: add fixed size list support

src/ast/data_type.rs

@@ -349,7 +349,8 @@ impl fmt::Display for DataType {
             DataType::Bytea => write!(f, "BYTEA"),
             DataType::Array(ty) => match ty {
                 ArrayElemTypeDef::None => write!(f, "ARRAY"),
-                ArrayElemTypeDef::SquareBracket(t) => write!(f, "{t}[]"),
+                ArrayElemTypeDef::SquareBracket(t, None) => write!(f, "{t}[]"),
+                ArrayElemTypeDef::SquareBracket(t, Some(size)) => write!(f, "{t}[{size}]"),
                 ArrayElemTypeDef::AngleBracket(t) => write!(f, "ARRAY<{t}>"),
             },
             DataType::Custom(ty, modifiers) => {
@@ -592,6 +593,6 @@ pub enum ArrayElemTypeDef {
     None,
     /// `ARRAY<INT>`
     AngleBracket(Box<DataType>),
-    /// `[]INT`
-    SquareBracket(Box<DataType>),
+    /// `INT[]` or `INT[2]`
+    SquareBracket(Box<DataType>, Option<u64>),
 }

src/parser/mod.rs

@@ -6360,7 +6360,7 @@ impl<'a> Parser<'a> {
         &mut self,
     ) -> Result<(DataType, MatchedTrailingBracket), ParserError> {
         let next_token = self.next_token();
-        let mut trailing_bracket = false.into();
+        let mut trailing_bracket: MatchedTrailingBracket = false.into();
         let mut data = match next_token.token {
             Token::Word(w) => match w.keyword {
                 Keyword::BOOLEAN => Ok(DataType::Boolean),
@@ -6580,8 +6580,13 @@ impl<'a> Parser<'a> {
         // Parse array data types. Note: this is postgresql-specific and different from
         // Keyword::ARRAY syntax from above
         while self.consume_token(&Token::LBracket) {
+            let size = if dialect_of!(self is GenericDialect | DuckDbDialect | PostgreSqlDialect) {
+                self.maybe_parse(|p| p.parse_literal_uint())
+            } else {
+                None
+            };
             self.expect_token(&Token::RBracket)?;
-            data = DataType::Array(ArrayElemTypeDef::SquareBracket(Box::new(data)))
+            data = DataType::Array(ArrayElemTypeDef::SquareBracket(Box::new(data), size))
         }
         Ok((data, trailing_bracket))
     }

tests/sqlparser_common.rs

@@ -3132,7 +3132,7 @@ fn parse_create_table_hive_array() {
         let expected = if angle_bracket_syntax {
             ArrayElemTypeDef::AngleBracket(expected)
         } else {
-            ArrayElemTypeDef::SquareBracket(expected)
+            ArrayElemTypeDef::SquareBracket(expected, None)
         };
 
         match dialects.one_statement_parses_to(sql.as_str(), sql.as_str()) {
@@ -9257,3 +9257,21 @@ fn test_select_wildcard_with_replace() {
     });
     assert_eq!(expected, select.projection[0]);
 }
+
+#[test]
+fn parse_sized_list() {
+    let dialects = TestedDialects {
+        dialects: vec![
+            Box::new(GenericDialect {}),
+            Box::new(PostgreSqlDialect {}),
+            Box::new(DuckDbDialect {}),
+        ],
+        options: None,
+    };
+    let sql = r#"CREATE TABLE embeddings (data FLOAT[1536])"#;
+    dialects.verified_stmt(sql);
+    let sql = r#"CREATE TABLE embeddings (data FLOAT[1536][3])"#;
+    dialects.verified_stmt(sql);
+    let sql = r#"SELECT data::FLOAT[1536] FROM embeddings"#;
+    dialects.verified_stmt(sql);
+}

tests/sqlparser_postgres.rs

@@ -1917,11 +1917,13 @@ fn parse_array_index_expr() {
                     })],
                     named: true,
                 })),
-                data_type: DataType::Array(ArrayElemTypeDef::SquareBracket(Box::new(
-                    DataType::Array(ArrayElemTypeDef::SquareBracket(Box::new(DataType::Int(
+                data_type: DataType::Array(ArrayElemTypeDef::SquareBracket(
+                    Box::new(DataType::Array(ArrayElemTypeDef::SquareBracket(
+                        Box::new(DataType::Int(None)),
                         None
-                    ))))
-                ))),
+                    ))),
+                    None
+                )),
                 format: None,
             }))),
             indexes: vec![num[1].clone(), num[2].clone()],