How to use

supportsAggregateFunction

method

in

org.apache.calcite.sql.SqlDialect

@Override
public boolean matches(RelOptRuleCall call) {
 final HiveAggregate agg = call.rel(0);
 final HiveJdbcConverter converter = call.rel(1);
 for (AggregateCall relOptRuleOperand : agg.getAggCallList()) {
  SqlAggFunction f = relOptRuleOperand.getAggregation();
  if (f instanceof HiveSqlCountAggFunction) {
   //count distinct with more that one argument is not supported
   HiveSqlCountAggFunction countAgg = (HiveSqlCountAggFunction)f;
   if (countAgg.isDistinct() && 1 < relOptRuleOperand.getArgList().size()) {
    return false;
   }
  }
  SqlKind kind = f.getKind();
  if (!converter.getJdbcDialect().supportsAggregateFunction(kind)) {
   return false;
  }
 }
 return true;
}

/** Returns whether this JDBC data source can implement a given aggregate
 * function. */
private static boolean canImplement(SqlAggFunction aggregation, SqlDialect sqlDialect) {
 return sqlDialect.supportsAggregateFunction(aggregation.getKind());
}

/** Returns whether this JDBC data source can implement a given aggregate
 * function. */
private static boolean canImplement(SqlAggFunction aggregation, SqlDialect sqlDialect) {
 return sqlDialect.supportsAggregateFunction(aggregation.getKind());
}