chore: Update grammars

.buildkite/scripts/esql_grammar_sync.sh

@@ -158,7 +158,7 @@ main () {
   git config --global user.name "$MACHINE_USERNAME"
   git config --global user.email 'elasticmachine@users.noreply.github.com'
 
-  PR_TITLE='[ES|QL] Update grammars'
+  PR_TITLE='chore: [ES|QL] Update grammars'
   PR_BODY='This PR updates the ES|QL grammars (lexer and parser) and PromQL grammars to match the latest version in Elasticsearch.'
 
   # Check if a PR already exists

src/parser/__tests__/change_point.test.ts

@@ -220,63 +220,11 @@ describe('CHANGE_POINT command', () => {
   });
 
   describe('configuration order', () => {
-    it('parses AS before ON (reversed order)', () => {
+    it('Throws error if AS is before ON (reversed order)', () => {
       const text = `FROM index | CHANGE_POINT value AS type, pvalue ON key`;
       const query = EsqlQuery.fromSrc(text);
 
-      expect(query.errors.length).toBe(0);
-      expect(query.ast.commands[1]).toMatchObject({
-        type: 'command',
-        name: 'change_point',
-        value: {
-          type: 'column',
-          name: 'value',
-        },
-        key: {
-          type: 'column',
-          name: 'key',
-        },
-        target: {
-          type: {
-            type: 'column',
-            name: 'type',
-          },
-          pvalue: {
-            type: 'column',
-            name: 'pvalue',
-          },
-        },
-        args: [
-          {
-            type: 'column',
-            name: 'value',
-          },
-          {
-            type: 'option',
-            name: 'as',
-            args: [
-              {
-                type: 'column',
-                name: 'type',
-              },
-              {
-                type: 'column',
-                name: 'pvalue',
-              },
-            ],
-          },
-          {
-            type: 'option',
-            name: 'on',
-            args: [
-              {
-                type: 'column',
-                name: 'key',
-              },
-            ],
-          },
-        ],
-      });
+      expect(query.errors.length).toBe(1);
     });
   });
 

src/parser/antlr/esql_parser.g4

@@ -311,12 +311,7 @@ sampleCommand
     ;
 
 changePointCommand
-    : CHANGE_POINT value=qualifiedName (changePointConfiguration)*
-    ;
-
-changePointConfiguration
-    : ON key=qualifiedName
-    | AS targetType=qualifiedName COMMA targetPvalue=qualifiedName
+    : CHANGE_POINT value=qualifiedName (ON key=qualifiedName)? (AS targetType=qualifiedName COMMA targetPvalue=qualifiedName)?
     ;
 
 forkCommand