[ES|QL] Open bracket parsing bug

packages/kbn-esql-ast/src/parser/__tests__/from.test.ts

@@ -187,5 +187,21 @@ describe('FROM', () => {
 
       expect(errors.length > 0).toBe(true);
     });
+
+    it('when open square bracket "[" is entered', () => {
+      const text = 'FROM kibana_sample_data_logs [';
+      const { errors } = parse(text);
+
+      expect(errors.length > 0).toBe(true);
+      expect(errors[0].message.toLowerCase().includes('metadata')).toBe(true);
+    });
+
+    it('when close square bracket "]" is entered', () => {
+      const text = 'FROM kibana_sample_data_logs []';
+      const { errors } = parse(text);
+
+      expect(errors.length > 0).toBe(true);
+      expect(errors[0].message.toLowerCase().includes('metadata')).toBe(true);
+    });
   });
 });

packages/kbn-esql-ast/src/parser/esql_ast_builder_listener.ts

@@ -120,7 +120,7 @@ export class ESQLAstBuilderListener implements ESQLParserListener {
     const metadataContext = ctx.metadata();
     const metadataContent =
       metadataContext?.deprecated_metadata()?.metadataOption() || metadataContext?.metadataOption();
-    if (metadataContent) {
+    if (metadataContent && metadataContent.METADATA()) {
       const option = createOption(
         metadataContent.METADATA().getText().toLowerCase(),
         metadataContent