"Set the max extended memory of partial aggregation in bytes. When this option is set " +
  "to a value greater than 0, it will override spark.gluten.sql.columnar.backend.velox." +
  "maxExtendedPartialAggregationMemoryRatio. Note: this option only works when " +
  "flushable partial aggregation is enabled. Ignored when " +
  "spark.gluten.sql.columnar.backend.velox.flushablePartialAggregation=false.