sqlite3-parser: separate boxed SelectInner struct

vendored/sqlite3-parser/src/parser/ast/check.rs

@@ -305,7 +305,10 @@ impl OneSelect {
     /// Like `sqlite3_column_count` but more limited
     pub fn column_count(&self) -> ColumnCount {
         match self {
-            Self::Select { columns, .. } => column_count(columns),
+            Self::Select(select) => {
+                let SelectInner { columns, .. } = &**select;
+                column_count(columns)
+            }
             Self::Values(values) => {
                 assert!(!values.is_empty()); // TODO Validate
                 ColumnCount::Fixed(values[0].len())

vendored/sqlite3-parser/src/parser/ast/fmt.rs

@@ -893,14 +893,15 @@ impl Display for CompoundOperator {
 impl ToTokens for OneSelect {
     fn to_tokens<S: TokenStream>(&self, s: &mut S) -> Result<(), S::Error> {
         match self {
-            Self::Select {
-                distinctness,
-                columns,
-                from,
-                where_clause,
-                group_by,
-                window_clause,
-            } => {
+            Self::Select(select) => {
+                let SelectInner {
+                    distinctness,
+                    columns,
+                    from,
+                    where_clause,
+                    group_by,
+                    window_clause,
+                } = &**select;
                 s.append(TK_SELECT, None)?;
                 if let Some(ref distinctness) = distinctness {
                     distinctness.to_tokens(s)?;

vendored/sqlite3-parser/src/parser/ast/mod.rs

@@ -779,24 +779,28 @@ pub enum CompoundOperator {
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum OneSelect {
     /// `SELECT`
-    Select {
-        /// `DISTINCT`
-        distinctness: Option<Distinctness>,
-        /// columns
-        columns: Vec<ResultColumn>,
-        /// `FROM` clause
-        from: Option<FromClause>,
-        /// `WHERE` clause
-        where_clause: Option<Expr>,
-        /// `GROUP BY`
-        group_by: Option<GroupBy>,
-        /// `WINDOW` definition
-        window_clause: Option<Vec<WindowDef>>,
-    },
+    Select(Box<SelectInner>),
     /// `VALUES`
     Values(Vec<Vec<Expr>>),
 }
 
+#[derive(Clone, Debug, PartialEq, Eq)]
+/// `SELECT` core
+pub struct SelectInner {
+    /// `DISTINCT`
+    pub distinctness: Option<Distinctness>,
+    /// columns
+    pub columns: Vec<ResultColumn>,
+    /// `FROM` clause
+    pub from: Option<FromClause>,
+    /// `WHERE` clause
+    pub where_clause: Option<Expr>,
+    /// `GROUP BY`
+    pub group_by: Option<GroupBy>,
+    /// `WINDOW` definition
+    pub window_clause: Option<Vec<WindowDef>>,
+}
+
 /// `SELECT` ... `FROM` clause
 // https://sqlite.org/syntax/join-clause.html
 #[derive(Clone, Debug, PartialEq, Eq)]