Support sql has comma before grouping sets #6402
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Both sql
SELECT brand, size, sum(sales) FROM items_sold GROUP BY brand, size, GROUPING SETS ((brand), (size), ());and
SELECT brand, size, sum(sales) FROM items_sold GROUP BY brand, size GROUPING SETS ((brand), (size), ());is allowed in many dbms like hive,spark,odps. we need to support them.