Added relative path to refresh parsing

Author: romanoff

src/ast/ddl.rs

@@ -371,10 +371,15 @@ pub enum AlterTableOperation {
     DropClusteringKey,
     SuspendRecluster,
     ResumeRecluster,
-    /// `REFRESH`
+    /// `REFRESH [ '<subpath>' ]`
     ///
-    /// Note: this is Snowflake specific for dynamic tables <https://docs.snowflake.com/en/sql-reference/sql/alter-table>
-    Refresh,
+    /// Note: this is Snowflake specific for dynamic/external tables
+    /// <https://docs.snowflake.com/en/sql-reference/sql/alter-dynamic-table>
+    /// <https://docs.snowflake.com/en/sql-reference/sql/alter-external-table>
+    Refresh {
+        /// Optional subpath for external table refresh
+        subpath: Option<String>,
+    },
     /// `ADD PARTITION COLUMN <column_name> <data_type>`
     ///
     /// Note: this is Snowflake specific for external tables <https://docs.snowflake.com/en/sql-reference/sql/alter-external-table>
@@ -870,8 +875,12 @@ impl fmt::Display for AlterTableOperation {
                 write!(f, "RESUME RECLUSTER")?;
                 Ok(())
             }
-            AlterTableOperation::Refresh => {
-                write!(f, "REFRESH")
+            AlterTableOperation::Refresh { subpath } => {
+                write!(f, "REFRESH")?;
+                if let Some(path) = subpath {
+                    write!(f, " '{path}'")?;
+                }
+                Ok(())
             }
             AlterTableOperation::AddPartitionColumn {
                 column_name,

src/ast/spans.rs

@@ -1145,7 +1145,7 @@ impl Spanned for AlterTableOperation {
             AlterTableOperation::DropClusteringKey => Span::empty(),
             AlterTableOperation::SuspendRecluster => Span::empty(),
             AlterTableOperation::ResumeRecluster => Span::empty(),
-            AlterTableOperation::Refresh => Span::empty(),
+            AlterTableOperation::Refresh { .. } => Span::empty(),
             AlterTableOperation::AddPartitionColumn { column_name, .. } => column_name.span,
             AlterTableOperation::Suspend => Span::empty(),
             AlterTableOperation::Resume => Span::empty(),

src/dialect/snowflake.rs

@@ -624,7 +624,7 @@ fn parse_alter_dynamic_table(parser: &mut Parser) -> Result<Statement, ParserErr
 
     // Parse the operation (REFRESH, SUSPEND, or RESUME)
     let operation = if parser.parse_keyword(Keyword::REFRESH) {
-        AlterTableOperation::Refresh
+        AlterTableOperation::Refresh { subpath: None }
     } else if parser.parse_keyword(Keyword::SUSPEND) {
         AlterTableOperation::Suspend
     } else if parser.parse_keyword(Keyword::RESUME) {
@@ -662,7 +662,15 @@ fn parse_alter_external_table(parser: &mut Parser) -> Result<Statement, ParserEr
 
     // Parse the operation
     let operation = if parser.parse_keyword(Keyword::REFRESH) {
-        AlterTableOperation::Refresh
+        // Optional subpath for refreshing specific partitions
+        let subpath = match parser.peek_token().token {
+            Token::SingleQuotedString(s) => {
+                parser.next_token();
+                Some(s)
+            }
+            _ => None,
+        };
+        AlterTableOperation::Refresh { subpath }
     } else if parser.parse_keywords(&[Keyword::RENAME, Keyword::TO]) {
         let new_table_name = parser.parse_object_name(false)?;
         AlterTableOperation::RenameTable {

tests/sqlparser_snowflake.rs

@@ -4639,6 +4639,7 @@ fn test_alter_dynamic_table() {
 #[test]
 fn test_alter_external_table() {
     snowflake().verified_stmt("ALTER EXTERNAL TABLE some_table REFRESH");
+    snowflake().verified_stmt("ALTER EXTERNAL TABLE some_table REFRESH 'year=2025/month=12/'");
     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");