Added set auto_refresh parsing for alter external table

Author: romanoff

src/ast/ddl.rs

@@ -437,6 +437,16 @@ pub enum AlterTableOperation {
     SetOptionsParens {
         options: Vec<SqlOption>,
     },
+    /// `SET key = value` options without parentheses.
+    ///
+    /// Example:
+    /// ```sql
+    /// SET AUTO_REFRESH = TRUE
+    /// ```
+    /// [Snowflake](https://docs.snowflake.com/en/sql-reference/sql/alter-external-table)
+    SetOptions {
+        options: Vec<SqlOption>,
+    },
 }
 
 /// An `ALTER Policy` (`Statement::AlterPolicy`) operation
@@ -914,6 +924,9 @@ impl fmt::Display for AlterTableOperation {
             AlterTableOperation::SetOptionsParens { options } => {
                 write!(f, "SET ({})", display_comma_separated(options))
             }
+            AlterTableOperation::SetOptions { options } => {
+                write!(f, "SET {}", display_comma_separated(options))
+            }
         }
     }
 }

src/ast/spans.rs

@@ -1157,6 +1157,9 @@ impl Spanned for AlterTableOperation {
             AlterTableOperation::SetOptionsParens { options } => {
                 union_spans(options.iter().map(|i| i.span()))
             }
+            AlterTableOperation::SetOptions { options } => {
+                union_spans(options.iter().map(|i| i.span()))
+            }
         }
     }
 }

src/dialect/snowflake.rs

@@ -683,9 +683,22 @@ fn parse_alter_external_table(parser: &mut Parser) -> Result<Statement, ParserEr
             column_name,
             data_type,
         }
+    } else if parser.parse_keyword(Keyword::SET) {
+        // Parse SET key = value options (e.g., SET AUTO_REFRESH = TRUE)
+        let mut options = vec![];
+        loop {
+            let key = parser.parse_identifier()?;
+            parser.expect_token(&Token::Eq)?;
+            let value = parser.parse_expr()?;
+            options.push(SqlOption::KeyValue { key, value });
+            if !parser.consume_token(&Token::Comma) {
+                break;
+            }
+        }
+        AlterTableOperation::SetOptions { options }
     } else {
         return parser.expected(
-            "REFRESH, RENAME TO, or ADD PARTITION COLUMN after ALTER EXTERNAL TABLE",
+            "REFRESH, RENAME TO, ADD PARTITION COLUMN, or SET after ALTER EXTERNAL TABLE",
             parser.peek_token(),
         );
     };

tests/sqlparser_snowflake.rs

@@ -4643,4 +4643,5 @@ fn test_alter_external_table() {
     snowflake().verified_stmt("ALTER EXTERNAL TABLE my_database.my_schema.my_external_table REFRESH");
     snowflake().verified_stmt("ALTER EXTERNAL TABLE some_table RENAME TO new_table_name");
     snowflake().verified_stmt("ALTER EXTERNAL TABLE some_table ADD PARTITION COLUMN column_name VARCHAR");
+    snowflake().verified_stmt("ALTER EXTERNAL TABLE some_table SET AUTO_REFRESH = true");
 }