sqlite3-parser: add support for ALTER TABLE ALTER COLUMN

Fixes #447

Author: psarna

Cargo.lock

@@ -1965,6 +1965,7 @@ pub enum AlterTableBody {
     AddColumn(ColumnDefinition), // TODO distinction between ADD and ADD COLUMN
     RenameColumn { old: Name, new: Name },
     DropColumn(Name), // TODO distinction between DROP and DROP COLUMN
+    AlterColumn { old: Name, cd: ColumnDefinition },
 }
 impl ToTokens for AlterTableBody {
     fn to_tokens<S: TokenStream>(&self, s: &mut S) -> Result<(), S::Error> {
@@ -1990,6 +1991,13 @@ impl ToTokens for AlterTableBody {
                 s.append(TK_COLUMNKW, None)?;
                 name.to_tokens(s)
             }
+            AlterTableBody::AlterColumn { old, cd } => {
+                s.append(TK_ALTER, None)?;
+                s.append(TK_COLUMNKW, None)?;
+                old.to_tokens(s)?;
+                s.append(TK_TO, None)?;
+                cd.to_tokens(s)
+            }
         }
     }
 }

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

@@ -1327,6 +1327,13 @@ cmd ::= ALTER TABLE fullname(X) DROP kwcolumn_opt nm(Y). {
   self.ctx.stmt = Some(Stmt::AlterTable(X, AlterTableBody::DropColumn(Y)));
 }
 
+cmd ::= ALTER TABLE fullname(X) ALTER COLUMNKW columnname(Y) TO columnname(Z) carglist(C). {
+  let (colfrom_name, _) = Y;
+  let (col_name, col_type) = Z;
+  let cd = ColumnDefinition{ col_name, col_type, constraints: C };
+  self.ctx.stmt = Some(Stmt::AlterTable(X, AlterTableBody::AlterColumn{ old: colfrom_name, cd }));
+}
+
 kwcolumn_opt ::= .
 kwcolumn_opt ::= COLUMNKW.
 %endif  SQLITE_OMIT_ALTERTABLE