add docs

Signed-off-by: Bugen Zhao <[email protected]>
risingwavelabs · Jan 6, 2025 · dcaec6e · dcaec6e
1 parent 0d6a067
commit dcaec6e
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/sqlparser/src/ast/ddl.rs b/src/sqlparser/src/ast/ddl.rs
@@ -739,8 +739,13 @@ pub enum ColumnOption {
     NotNull,
     /// `DEFAULT <restricted-expr>`
     DefaultValue(Expr),
+    /// Default value from previous bound `DefaultColumnDesc`. Used internally
+    /// and will not be parsed from SQL.
     DefaultValuePersisted {
+        /// Protobuf encoded `DefaultColumnDesc`.
         persisted: Box<[u8]>,
+        /// Optional AST for unparsing. If `None`, the default value will be
+        /// shown as `DEFAULT ...`, which is for demonstrating and not valid.
         expr: Option<Expr>,
     },
     /// `{ PRIMARY KEY | UNIQUE }`