public static String getComplexTypeEnabledCondition(
      boolean isVectorizationComplexTypesEnabled) {
    return
        HiveConf.ConfVars.HIVE_VECTORIZATION_COMPLEX_TYPES_ENABLED.varname +
        " IS " + isVectorizationComplexTypesEnabled;
  }
Checks if this grouping is like distinct, which means that all non-distinct grouping
columns behave like they were distinct - for example min and max operators.
ql/src/java/org/apache/hadoop/hive/ql/plan/GroupByDesc.java