feat: support postgres alter schema (apache#2038)

Author: chenkovsky

src/ast/ddl.rs

@@ -3084,6 +3084,7 @@ impl fmt::Display for CreateConnector {
 /// An `ALTER SCHEMA` (`Statement::AlterSchema`) operation.
 ///
 /// See [BigQuery](https://cloud.google.com/bigquery/docs/reference/standard-sql/data-definition-language#alter_schema_collate_statement)
+/// See [PostgreSQL](https://www.postgresql.org/docs/current/sql-alterschema.html)
 #[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[cfg_attr(feature = "visitor", derive(Visit, VisitMut))]
@@ -3101,6 +3102,12 @@ pub enum AlterSchemaOperation {
     SetOptionsParens {
         options: Vec<SqlOption>,
     },
+    Rename {
+        name: ObjectName,
+    },
+    OwnerTo {
+        owner: Owner,
+    },
 }
 
 impl fmt::Display for AlterSchemaOperation {
@@ -3120,6 +3127,8 @@ impl fmt::Display for AlterSchemaOperation {
             AlterSchemaOperation::SetOptionsParens { options } => {
                 write!(f, "SET OPTIONS ({})", display_comma_separated(options))
             }
+            AlterSchemaOperation::Rename { name } => write!(f, "RENAME TO {name}"),
+            AlterSchemaOperation::OwnerTo { owner } => write!(f, "OWNER TO {owner}"),
         }
     }
 }

src/ast/spans.rs

@@ -17,7 +17,7 @@
 
 use crate::ast::{
     ddl::AlterSchema, query::SelectItemQualifiedWildcardKind, AlterSchemaOperation, ColumnOptions,
-    ExportData, TypedString,
+    ExportData, Owner, TypedString,
 };
 use core::iter;
 
@@ -2433,6 +2433,14 @@ impl Spanned for AlterSchemaOperation {
             AlterSchemaOperation::SetOptionsParens { options } => {
                 union_spans(options.iter().map(|i| i.span()))
             }
+            AlterSchemaOperation::Rename { name } => name.span(),
+            AlterSchemaOperation::OwnerTo { owner } => {
+                if let Owner::Ident(ident) = owner {
+                    ident.span
+                } else {
+                    Span::empty()
+                }
+            }
         }
     }
 }

src/parser/mod.rs

@@ -9475,6 +9475,12 @@ impl<'a> Parser<'a> {
         } else if self.parse_keywords(&[Keyword::DROP, Keyword::REPLICA]) {
             let replica = self.parse_identifier()?;
             AlterSchemaOperation::DropReplica { replica }
+        } else if self.parse_keywords(&[Keyword::RENAME, Keyword::TO]) {
+            let new_name = self.parse_object_name(false)?;
+            AlterSchemaOperation::Rename { name: new_name }
+        } else if self.parse_keywords(&[Keyword::OWNER, Keyword::TO]) {
+            let owner = self.parse_owner()?;
+            AlterSchemaOperation::OwnerTo { owner }
         } else {
             return self.expected_ref("ALTER SCHEMA operation", self.peek_token_ref());
         };

tests/sqlparser_postgres.rs

@@ -6576,3 +6576,66 @@ fn parse_create_server() {
         assert_eq!(stmt, expected);
     }
 }
+
+#[test]
+fn parse_alter_schema() {
+    match pg_and_generic().verified_stmt("ALTER SCHEMA foo RENAME TO bar") {
+        Statement::AlterSchema(AlterSchema { operations, .. }) => {
+            assert_eq!(
+                operations,
+                vec![AlterSchemaOperation::Rename {
+                    name: ObjectName::from(vec!["bar".into()])
+                }]
+            );
+        }
+        _ => unreachable!(),
+    }
+
+    match pg_and_generic().verified_stmt("ALTER SCHEMA foo OWNER TO bar") {
+        Statement::AlterSchema(AlterSchema { operations, .. }) => {
+            assert_eq!(
+                operations,
+                vec![AlterSchemaOperation::OwnerTo {
+                    owner: Owner::Ident("bar".into())
+                }]
+            );
+        }
+        _ => unreachable!(),
+    }
+
+    match pg_and_generic().verified_stmt("ALTER SCHEMA foo OWNER TO CURRENT_ROLE") {
+        Statement::AlterSchema(AlterSchema { operations, .. }) => {
+            assert_eq!(
+                operations,
+                vec![AlterSchemaOperation::OwnerTo {
+                    owner: Owner::CurrentRole
+                }]
+            );
+        }
+        _ => unreachable!(),
+    }
+
+    match pg_and_generic().verified_stmt("ALTER SCHEMA foo OWNER TO CURRENT_USER") {
+        Statement::AlterSchema(AlterSchema { operations, .. }) => {
+            assert_eq!(
+                operations,
+                vec![AlterSchemaOperation::OwnerTo {
+                    owner: Owner::CurrentUser
+                }]
+            );
+        }
+        _ => unreachable!(),
+    }
+
+    match pg_and_generic().verified_stmt("ALTER SCHEMA foo OWNER TO SESSION_USER") {
+        Statement::AlterSchema(AlterSchema { operations, .. }) => {
+            assert_eq!(
+                operations,
+                vec![AlterSchemaOperation::OwnerTo {
+                    owner: Owner::SessionUser
+                }]
+            );
+        }
+        _ => unreachable!(),
+    }
+}