Drop the UnsupportedGrammarStmt node type

Author: nene

src/cst/Statement.ts

@@ -31,7 +31,6 @@ import { InsertStmt } from "./Insert";
 import { MergeStmt } from "./Merge";
 import { TruncateStmt } from "./Truncate";
 import { UpdateStmt } from "./Update";
-import { UnsupportedGrammarStmt } from "./UnsupportedGrammar";
 import { DoStmt } from "./Do";
 
 export type Statement =
@@ -69,5 +68,4 @@ export type Statement =
   | MergeStmt
   | SelectStmt
   | TruncateStmt
-  | UpdateStmt
-  | UnsupportedGrammarStmt;
+  | UpdateStmt;

src/cst/UnsupportedGrammar.ts

@@ -46,7 +46,6 @@ import { bigqueryMap } from "./dialects/bigquery";
 import { postgresqlMap } from "./dialects/postgresql";
 import { sqliteMap } from "./dialects/sqlite";
 import { mysqlMap } from "./dialects/mysql";
-import { unsupportedGrammarMap } from "./unsupported_grammar";
 
 export const transformMap: FullTransformMap<string> = {
   ...baseMap,
@@ -109,6 +108,4 @@ export const transformMap: FullTransformMap<string> = {
   // Expressions
   ...exprMap,
   ...dataTypeMap,
-
-  ...unsupportedGrammarMap,
 };