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// Copyright 2026 RadixDB Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use super::*;
impl Parser {
/// Parse an ALTER statement
pub(super) fn parse_alter_statement(&mut self) -> Option<Statement> {
let token = self.cur_token.clone();
if self.peek_token_is_keyword("TABLE") {
return self.parse_alter_table_statement();
}
if self.peek_token_is_keyword("INDEX") {
self.next_token();
return self
.parse_alter_index_statement(token)
.map(Statement::AlterIndex);
}
if self.peek_token_is_keyword("FUNCTION") {
return self
.parse_alter_routine_owner_statement(token, RoutineKindSyntax::Function)
.map(|statement| Statement::AlterOwner(Box::new(statement)));
}
if self.peek_token_is_keyword("PROCEDURE") {
return self
.parse_alter_routine_owner_statement(token, RoutineKindSyntax::Procedure)
.map(|statement| Statement::AlterOwner(Box::new(statement)));
}
if self.peek_token_is_keyword("PRINCIPAL") {
return self
.parse_alter_security_subject_statement(token, SecuritySubjectKindSyntax::Principal)
.map(Statement::AlterSecuritySubject);
}
if self.peek_token_is_keyword("ROLE") {
return self
.parse_alter_security_subject_statement(token, SecuritySubjectKindSyntax::Role)
.map(Statement::AlterSecuritySubject);
}
if self.peek_token_is_keyword("JOB") {
self.next_token();
return self
.parse_alter_job_statement(token)
.map(|statement| Statement::AlterJob(Box::new(statement)));
}
self.add_error(format!(
"expected TABLE, INDEX, FUNCTION, PROCEDURE, PRINCIPAL, ROLE, or JOB after ALTER at {}",
self.cur_token.position
));
None
}
/// Parse an ALTER TABLE statement
pub(super) fn parse_alter_table_statement(&mut self) -> Option<Statement> {
let token = self.cur_token.clone();
// Expect TABLE
if !self.expect_keyword("TABLE") {
return None;
}
// Parse table name
if !self.expect_peek_procedural_identifier() {
return None;
}
let qualified_name = self.parse_object_name_current()?;
if self.peek_token_is_keyword("OWNER") {
return self
.parse_table_owner_after_name(token, qualified_name)
.map(|statement| Statement::AlterOwner(Box::new(statement)));
}
let is_qualified = qualified_name.components.len() != 1;
let table_name = Self::relation_identifier_from_object_name(&qualified_name);
// Parse operation
if !self.peek_token_is(TokenType::Keyword) {
self.add_error(
"expected ALTER action (ADD, DROP, RENAME) after table name".to_string(),
);
return None;
}
self.next_token();
let operation_keyword = self.cur_token.literal.to_uppercase();
let (
operation,
column_def,
table_constraint,
column_name,
constraint_name,
if_exists,
new_column_name,
new_table_name,
) = match operation_keyword.as_str() {
"ADD" => {
if self.peek_token_is_keyword("CONSTRAINT") {
self.next_token();
self.next_token();
let constraint = match self.parse_column_or_constraint()? {
ColumnOrConstraint::Constraint(constraint) => constraint,
ColumnOrConstraint::Column(_) => {
self.add_error(
"expected table constraint after ADD CONSTRAINT".to_string(),
);
return None;
}
};
(
AlterTableOperation::AddConstraint,
None,
Some(constraint),
None,
None,
false,
None,
None,
)
} else if self.peek_token_is_keyword("UNIQUE")
|| self.peek_token_is_keyword("CHECK")
|| self.peek_token_is_keyword("PRIMARY")
|| self.peek_token_is_keyword("FOREIGN")
{
self.next_token();
let constraint = match self.parse_column_or_constraint()? {
ColumnOrConstraint::Constraint(constraint) => constraint,
ColumnOrConstraint::Column(_) => unreachable!(),
};
(
AlterTableOperation::AddConstraint,
None,
Some(constraint),
None,
None,
false,
None,
None,
)
} else {
// Check for optional COLUMN keyword
if self.peek_token_is_keyword("COLUMN") {
self.next_token();
}
self.next_token();
let col_def = self.parse_column_definition()?;
(
AlterTableOperation::AddColumn,
Some(col_def),
None,
None,
None,
false,
None,
None,
)
}
}
"DROP" => {
if self.peek_token_is_keyword("CONSTRAINT") {
self.next_token();
let mut if_exists = false;
if self.peek_token_is_keyword("IF") {
self.next_token();
if !self.expect_keyword("EXISTS") {
return None;
}
if_exists = true;
}
if !self.expect_peek(TokenType::Identifier) {
return None;
}
let constraint_name =
Identifier::new(self.cur_token.clone(), self.cur_token.literal.clone());
(
AlterTableOperation::DropConstraint,
None,
None,
None,
Some(constraint_name),
if_exists,
None,
None,
)
} else {
// Check for optional COLUMN keyword
if self.peek_token_is_keyword("COLUMN") {
self.next_token();
}
if !self.expect_peek(TokenType::Identifier) {
return None;
}
let col_name =
Identifier::new(self.cur_token.clone(), self.cur_token.literal.clone());
(
AlterTableOperation::DropColumn,
None,
None,
Some(col_name),
None,
false,
None,
None,
)
}
}
"RENAME" => {
if !self.expect_peek(TokenType::Keyword) {
return None;
}
let rename_keyword = self.cur_token.literal.to_uppercase();
if rename_keyword == "COLUMN" {
if !self.expect_peek(TokenType::Identifier) {
return None;
}
let col_name =
Identifier::new(self.cur_token.clone(), self.cur_token.literal.clone());
if !self.expect_keyword("TO") {
return None;
}
if !self.expect_peek(TokenType::Identifier) {
return None;
}
let new_col_name =
Identifier::new(self.cur_token.clone(), self.cur_token.literal.clone());
(
AlterTableOperation::RenameColumn,
None,
None,
Some(col_name),
None,
false,
Some(new_col_name),
None,
)
} else if rename_keyword == "TO" {
if !self.expect_peek(TokenType::Identifier) {
return None;
}
let new_tbl_name =
Identifier::new(self.cur_token.clone(), self.cur_token.literal.clone());
(
AlterTableOperation::RenameTable,
None,
None,
None,
None,
false,
None,
Some(new_tbl_name),
)
} else {
self.add_error(format!(
"expected COLUMN or TO after RENAME at {}",
self.cur_token.position
));
return None;
}
}
"MODIFY" => {
// Check for optional COLUMN keyword
if self.peek_token_is_keyword("COLUMN") {
self.next_token();
}
self.next_token();
let col_def = self.parse_column_definition()?;
(
AlterTableOperation::ModifyColumn,
Some(col_def),
None,
None,
None,
false,
None,
None,
)
}
_ => {
self.add_error(format!(
"expected ADD, DROP, RENAME, or MODIFY at {}",
self.cur_token.position
));
return None;
}
};
if self.reject_unsupported_qualified_alter(is_qualified, operation) {
return None;
}
Some(Statement::AlterTable(Box::new(AlterTableStatement {
token,
table_name,
operation,
column_def,
table_constraint,
column_name,
constraint_name,
if_exists,
new_column_name,
new_table_name,
})))
}
/// Parse an ALTER INDEX statement.
///
/// The public contract is intentionally narrow for now:
/// ALTER INDEX old_name RENAME TO new_name
pub(super) fn parse_alter_index_statement(
&mut self,
token: Token,
) -> Option<AlterIndexStatement> {
// Current token is INDEX, parse old index name.
if !self.expect_peek(TokenType::Identifier) {
return None;
}
let index_name = Identifier::new(self.cur_token.clone(), self.cur_token.literal.clone());
if !self.expect_keyword("RENAME") {
return None;
}
if !self.expect_keyword("TO") {
return None;
}
if !self.expect_peek(TokenType::Identifier) {
return None;
}
let new_index_name =
Identifier::new(self.cur_token.clone(), self.cur_token.literal.clone());
Some(AlterIndexStatement {
token,
index_name,
new_index_name,
})
}
}