Parse error with GROUPING soql function

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Example code:

public class MyClassA3 {
    private List<AggregateResult> getDefects() {
        AggregateResult[] defects = [
            SELECT
              OBJ1__c O1,
              OBJ2__c O2,
              OBJ3__c O3,
              SUM(OBJ4__c) O4,
              GROUPING(OBJ1__c) O1Group,
              GROUPING(OBJ2__c) O2Group,
              GROUPING(OBJ3__c) O3Group
            FROM OBJ4__c
            GROUP BY ROLLUP(OBJ1__c, OBJ2__c, OBJ3__c)
        ];
        return defects;
    }
}

This fails to parse, as GROUPING is not supported by the grammar:

apex-parser/antlr/ApexParser.g4

Lines 614 to 639 in fee3a16

	soqlFunction
	: AVG LPAREN fieldName RPAREN
	| COUNT LPAREN RPAREN
	| COUNT LPAREN fieldName RPAREN
	| COUNT_DISTINCT LPAREN fieldName RPAREN
	| MIN LPAREN fieldName RPAREN
	| MAX LPAREN fieldName RPAREN
	| SUM LPAREN fieldName RPAREN
	| TOLABEL LPAREN fieldName RPAREN
	| FORMAT LPAREN fieldName RPAREN
	| CALENDAR_MONTH LPAREN dateFieldName RPAREN
	| CALENDAR_QUARTER LPAREN dateFieldName RPAREN
	| CALENDAR_YEAR LPAREN dateFieldName RPAREN
	| DAY_IN_MONTH LPAREN dateFieldName RPAREN
	| DAY_IN_WEEK LPAREN dateFieldName RPAREN
	| DAY_IN_YEAR LPAREN dateFieldName RPAREN
	| DAY_ONLY LPAREN dateFieldName RPAREN
	| FISCAL_MONTH LPAREN dateFieldName RPAREN
	| FISCAL_QUARTER LPAREN dateFieldName RPAREN
	| FISCAL_YEAR LPAREN dateFieldName RPAREN
	| HOUR_IN_DAY LPAREN dateFieldName RPAREN
	| WEEK_IN_MONTH LPAREN dateFieldName RPAREN
	| WEEK_IN_YEAR LPAREN dateFieldName RPAREN
	| FIELDS LPAREN soqlFieldsParameter RPAREN
	| DISTANCE LPAREN locationValue COMMA locationValue COMMA StringLiteral RPAREN
	;

sf doc: https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql_select_grouping.htm

Original issue: pmd/pmd#5182

[pwrightcertinia]

Thank you for the contribution! Now released in version 4.2.0