Support SELECT ALL

Co-authored-by: Nikhil Benesch <nikhil.benesch@gmail.com>

src/sqlparser.rs

@@ -1300,7 +1300,11 @@ impl Parser {
     /// Parse a restricted `SELECT` statement (no CTEs / `UNION` / `ORDER BY`),
     /// assuming the initial `SELECT` was already consumed
     pub fn parse_select(&mut self) -> Result<SQLSelect, ParserError> {
+        let all = self.parse_keyword("ALL");
         let distinct = self.parse_keyword("DISTINCT");
+        if all && distinct {
+            return parser_err!("Cannot specify both ALL and DISTINCT in SELECT");
+        }
         let projection = self.parse_select_list()?;
 
         let (relation, joins) = if self.parse_keyword("FROM") {

tests/sqlparser_common.rs

@@ -135,6 +135,20 @@ fn parse_select_distinct() {
     );
 }
 
+#[test]
+fn parse_select_all() {
+    one_statement_parses_to("SELECT ALL name FROM customer", "SELECT name FROM customer");
+}
+
+#[test]
+fn parse_select_all_distinct() {
+    let result = parse_sql_statements("SELECT ALL DISTINCT name FROM customer");
+    assert_eq!(
+        ParserError::ParserError("Cannot specify both ALL and DISTINCT in SELECT".to_string()),
+        result.unwrap_err(),
+    );
+}
+
 #[test]
 fn parse_select_wildcard() {
     let sql = "SELECT * FROM foo";