Add support for GRANT .. AS role syntax

Author: aharpervc

src/ast/mod.rs

@@ -3791,6 +3791,7 @@ pub enum Statement {
         objects: Option<GrantObjects>,
         grantees: Vec<Grantee>,
         with_grant_option: bool,
+        as_grantor: Option<Ident>,
         granted_by: Option<Ident>,
     },
     /// ```sql
@@ -5413,6 +5414,7 @@ impl fmt::Display for Statement {
                 objects,
                 grantees,
                 with_grant_option,
+                as_grantor,
                 granted_by,
             } => {
                 write!(f, "GRANT {privileges} ")?;
@@ -5423,6 +5425,9 @@ impl fmt::Display for Statement {
                 if *with_grant_option {
                     write!(f, " WITH GRANT OPTION")?;
                 }
+                if let Some(grantor) = as_grantor {
+                    write!(f, " AS {grantor}")?;
+                }
                 if let Some(grantor) = granted_by {
                     write!(f, " GRANTED BY {grantor}")?;
                 }

src/parser/mod.rs

@@ -12999,15 +12999,26 @@ impl<'a> Parser<'a> {
         let with_grant_option =
             self.parse_keywords(&[Keyword::WITH, Keyword::GRANT, Keyword::OPTION]);
 
-        let granted_by = self
-            .parse_keywords(&[Keyword::GRANTED, Keyword::BY])
-            .then(|| self.parse_identifier().unwrap());
+        let as_grantor = if self.peek_keyword(Keyword::AS) {
+            self.parse_keywords(&[Keyword::AS])
+                .then(|| self.parse_identifier().unwrap())
+        } else {
+            None
+        };
+
+        let granted_by = if self.peek_keywords(&[Keyword::GRANTED, Keyword::BY]) {
+            self.parse_keywords(&[Keyword::GRANTED, Keyword::BY])
+                .then(|| self.parse_identifier().unwrap())
+        } else {
+            None
+        };
 
         Ok(Statement::Grant {
             privileges,
             objects,
             grantees,
             with_grant_option,
+            as_grantor,
             granted_by,
         })
     }

tests/sqlparser_common.rs

@@ -9324,6 +9324,7 @@ fn parse_grant() {
     verified_stmt("GRANT OWNERSHIP ON INTEGRATION int1 TO ROLE role1");
     verified_stmt("GRANT SELECT ON VIEW view1 TO ROLE role1");
     verified_stmt("GRANT EXEC ON my_sp TO runner");
+    verified_stmt("GRANT UPDATE ON my_table TO updater_role AS dbo");
 
     all_dialects_where(|d| d.identifier_quote_style("none") == Some('['))
         .verified_stmt("GRANT SELECT ON [my_table] TO [public]");

tests/sqlparser_mysql.rs

@@ -3283,6 +3283,7 @@ fn parse_grant() {
         objects,
         grantees,
         with_grant_option,
+        as_grantor: _,
         granted_by,
     } = stmt
     {