PostgreSQL: Support ALTER MATERIALIZED VIEW

src/ast/ddl.rs

@@ -4849,11 +4849,16 @@ impl Spanned for AlterCollation {
     }
 }
 
-/// `ALTER VIEW` statement.
+/// `ALTER [ MATERIALIZED ] VIEW` statement.
+///
+/// See [PostgreSQL](https://www.postgresql.org/docs/current/sql-altermaterializedview.html)
 #[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
 pub struct AlterView {
+    /// Whether `MATERIALIZED` was specified. A materialized view's operation is never
+    /// [`AlterViewOperation::As`] or [`AlterViewOperation::AlterColumn`].
+    pub materialized: bool,
     /// View name being altered.
     #[cfg_attr(feature = "visitor", visit(with = "visit_relation"))]
     pub name: ObjectName,
@@ -4977,7 +4982,11 @@ impl fmt::Display for AlterViewOperation {
 
 impl fmt::Display for AlterView {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "ALTER VIEW ")?;
+        write!(f, "ALTER ")?;
+        if self.materialized {
+            write!(f, "MATERIALIZED ")?;
+        }
+        write!(f, "VIEW ")?;
         if self.if_exists {
             write!(f, "IF EXISTS ")?;
         }

src/ast/mod.rs

@@ -3911,7 +3911,7 @@ pub enum Statement {
         operation: AlterIndexOperation,
     },
     /// ```sql
-    /// ALTER VIEW
+    /// ALTER [ MATERIALIZED ] VIEW
     /// ```
     AlterView(AlterView),
     /// ```sql

src/parser/mod.rs

@@ -11847,7 +11847,11 @@ impl<'a> Parser<'a> {
                 self.prev_token();
                 self.parse_alter_schema()
             }
-            Keyword::VIEW => self.parse_alter_view(),
+            Keyword::VIEW => self.parse_alter_view(false),
+            Keyword::MATERIALIZED => {
+                self.expect_keyword_is(Keyword::VIEW)?;
+                self.parse_alter_view(true)
+            }
             Keyword::TYPE => self.parse_alter_type(),
             Keyword::COLLATION => self.parse_alter_collation().map(Into::into),
             Keyword::TABLE => self.parse_alter_table(false),
@@ -11895,7 +11899,7 @@ impl<'a> Parser<'a> {
             _ => {
                 self.index = index;
                 self.expected_ref(
-                    "one of VIEW or TYPE or COLLATION or TABLE or INDEX or FUNCTION or AGGREGATE or ROLE or POLICY or TRIGGER or CONNECTOR or ICEBERG or SCHEMA or USER or OPERATOR",
+                    "one of VIEW or MATERIALIZED VIEW or TYPE or COLLATION or TABLE or INDEX or FUNCTION or AGGREGATE or ROLE or POLICY or TRIGGER or CONNECTOR or ICEBERG or SCHEMA or USER or OPERATOR",
                     self.peek_token_ref(),
                 )
             }
@@ -12159,8 +12163,8 @@ impl<'a> Parser<'a> {
         .into())
     }
 
-    /// Parse an `ALTER VIEW` statement.
-    pub fn parse_alter_view(&mut self) -> Result<Statement, ParserError> {
+    /// Parse an `ALTER [ MATERIALIZED ] VIEW` statement.
+    pub fn parse_alter_view(&mut self, materialized: bool) -> Result<Statement, ParserError> {
         let if_exists = self.parse_keywords(&[Keyword::IF, Keyword::EXISTS]);
         let name = self.parse_object_name(false)?;
 
@@ -12230,6 +12234,7 @@ impl<'a> Parser<'a> {
         };
 
         Ok(AlterView {
+            materialized,
             name,
             if_exists,
             operation,

tests/sqlparser_common.rs

@@ -5669,6 +5669,7 @@ fn parse_alter_view() {
     let sql = "ALTER VIEW myschema.myview AS SELECT foo FROM bar";
     match verified_stmt(sql) {
         Statement::AlterView(AlterView {
+            materialized: false,
             name,
             if_exists,
             operation:
@@ -5723,6 +5724,7 @@ fn parse_alter_view_with_columns() {
     let sql = "ALTER VIEW v (has, cols) AS SELECT 1, 2";
     match verified_stmt(sql) {
         Statement::AlterView(AlterView {
+            materialized: false,
             name,
             if_exists,
             operation:
@@ -5752,6 +5754,7 @@ fn parse_alter_view_operations() {
     assert_eq!(
         verified_stmt("ALTER VIEW IF EXISTS s.v OWNER TO o"),
         Statement::AlterView(AlterView {
+            materialized: false,
             name: ObjectName::from(vec![Ident::new("s"), Ident::new("v")]),
             if_exists: true,
             operation: AlterViewOperation::OwnerTo(Owner::Ident(Ident::new("o"))),
@@ -5902,7 +5905,7 @@ fn display_alter_view_propagates_write_errors() {
     }
 
     let with_options = verified_stmt("ALTER VIEW IF EXISTS v WITH (x = 1) AS SELECT 1");
-    for rejected in ["ALTER VIEW ", "IF EXISTS ", "WITH ("] {
+    for rejected in ["ALTER ", "VIEW ", "IF EXISTS ", "WITH ("] {
         let mut writer = RejectingWriter(rejected);
         assert_eq!(
             write!(writer, "{with_options}"),
@@ -5912,7 +5915,7 @@ fn display_alter_view_propagates_write_errors() {
     }
 
     let columns = verified_stmt("ALTER VIEW IF EXISTS v (zeta) AS SELECT 1");
-    for rejected in ["ALTER VIEW ", "IF EXISTS ", "("] {
+    for rejected in ["ALTER ", "VIEW ", "IF EXISTS ", "("] {
         let mut writer = RejectingWriter(rejected);
         assert_eq!(write!(writer, "{columns}"), Err(fmt::Error), "{rejected:?}");
     }
@@ -16070,7 +16073,7 @@ fn parse_alter_trigger_spans() {
 
 #[test]
 fn parse_alter_rejects_missing_or_unknown_object_type() {
-    let objects = "one of VIEW or TYPE or COLLATION or TABLE or INDEX or FUNCTION or AGGREGATE or ROLE or POLICY or TRIGGER or CONNECTOR or ICEBERG or SCHEMA or USER or OPERATOR";
+    let objects = "one of VIEW or MATERIALIZED VIEW or TYPE or COLLATION or TABLE or INDEX or FUNCTION or AGGREGATE or ROLE or POLICY or TRIGGER or CONNECTOR or ICEBERG or SCHEMA or USER or OPERATOR";
     for (sql, found) in [
         ("ALTER", "EOF"),
         ("ALTER 1", "1"),

tests/sqlparser_postgres.rs

@@ -12291,3 +12291,87 @@ fn parse_create_table_partition_of_untyped_columns() {
         );
     }
 }
+
+#[test]
+fn parse_alter_materialized_view() {
+    assert_eq!(
+        pg_and_generic().verified_stmt("ALTER MATERIALIZED VIEW IF EXISTS s.m OWNER TO alice"),
+        Statement::AlterView(AlterView {
+            materialized: true,
+            name: ObjectName::from(vec![Ident::new("s"), Ident::new("m")]),
+            if_exists: true,
+            operation: AlterViewOperation::OwnerTo(Owner::Ident(Ident::new("alice"))),
+        })
+    );
+    assert_eq!(
+        pg_and_generic().verified_stmt("ALTER MATERIALIZED VIEW m SET (fillfactor = 70)"),
+        Statement::AlterView(AlterView {
+            materialized: true,
+            name: ObjectName::from(vec![Ident::new("m")]),
+            if_exists: false,
+            operation: AlterViewOperation::SetOptions {
+                options: vec![SqlOption::KeyValue {
+                    key: ObjectName::from(vec![Ident::new("fillfactor")]),
+                    value: Expr::value(number("70")),
+                }],
+            },
+        })
+    );
+    for sql in [
+        "ALTER MATERIALIZED VIEW m RESET (fillfactor, autovacuum_enabled)",
+        "ALTER MATERIALIZED VIEW m RENAME TO m2",
+        "ALTER MATERIALIZED VIEW m RENAME COLUMN a TO b",
+        "ALTER MATERIALIZED VIEW m SET SCHEMA s",
+    ] {
+        pg_and_generic().verified_stmt(sql);
+    }
+    assert_eq!(
+        pg_and_generic().verified_stmt("ALTER MATERIALIZED VIEW m ALTER COLUMN c SET DEFAULT 1"),
+        Statement::AlterView(AlterView {
+            materialized: true,
+            name: ObjectName::from(vec![Ident::new("m")]),
+            if_exists: false,
+            operation: AlterViewOperation::AlterColumn {
+                column_name: Ident::new("c"),
+                op: AlterColumnOperation::SetDefault {
+                    value: Expr::value(number("1")),
+                },
+            },
+        })
+    );
+    pg_and_generic().verified_stmt("ALTER MATERIALIZED VIEW m ALTER COLUMN c DROP DEFAULT");
+
+    assert_eq!(
+        pg_and_generic()
+            .parse_sql_statements("ALTER MATERIALIZED m OWNER TO alice")
+            .unwrap_err(),
+        ParserError::ParserError("Expected: VIEW, found: m".to_string())
+    );
+}
+
+#[test]
+fn display_alter_materialized_view_propagates_write_errors() {
+    use core::fmt::{self, Write};
+
+    struct RejectingWriter(&'static str);
+
+    impl Write for RejectingWriter {
+        fn write_str(&mut self, value: &str) -> fmt::Result {
+            if value == self.0 {
+                Err(fmt::Error)
+            } else {
+                Ok(())
+            }
+        }
+    }
+
+    let materialized = pg_and_generic().verified_stmt("ALTER MATERIALIZED VIEW m RENAME TO m2");
+    for rejected in ["ALTER ", "MATERIALIZED ", "VIEW "] {
+        let mut writer = RejectingWriter(rejected);
+        assert_eq!(
+            write!(writer, "{materialized}"),
+            Err(fmt::Error),
+            "{rejected:?}"
+        );
+    }
+}