code: package it.unibz.inf.ontop.model.term.functionsymbol.db.impl;
  
  import com.google.common.collect.*;
  import com.google.inject.Inject;
  import it.unibz.inf.ontop.model.term.ImmutableTerm;
  import it.unibz.inf.ontop.model.term.TermFactory;
  import it.unibz.inf.ontop.model.term.functionsymbol.db.DBConcatFunctionSymbol;
  import it.unibz.inf.ontop.model.term.functionsymbol.db.DBFunctionSymbol;
  import it.unibz.inf.ontop.model.term.functionsymbol.db.DBTypeConversionFunctionSymbol;
  import it.unibz.inf.ontop.model.type.DBTermType;
  import it.unibz.inf.ontop.model.type.DBTypeFactory;
  import it.unibz.inf.ontop.model.type.TypeFactory;
  
  import java.util.function.Function;
  
  import static it.unibz.inf.ontop.model.type.impl.SnowflakeDBTypeFactory.TIMESTAMP_LOCAL_TZ_STR;
  import static it.unibz.inf.ontop.model.type.impl.SnowflakeDBTypeFactory.TIMESTAMP_NO_TZ_STR;
  
  public class PrestoDBFunctionSymbolFactory extends TrinoDBFunctionSymbolFactory {
  
      @Inject
      protected PrestoDBFunctionSymbolFactory(TypeFactory typeFactory) {
          super(typeFactory);
      }
  
      @Override
      protected DBFunctionSymbol createDBGroupConcat(DBTermType dbStringType, boolean isDistinct) {
          return new NullIgnoringDBGroupConcatFunctionSymbol(dbStringType, isDistinct,
                  (terms, termConverter, termFactory) -> String.format(
                          "ARRAY_JOIN(%sARRAY_AGG(%s)%s, %s)",
                          isDistinct ? "ARRAY_DISTINCT( " : "",
                          termConverter.apply(terms.get(0)),
                          isDistinct ? ") " : "",
                          termConverter.apply(terms.get(1))
                  ));
      }
  
  }
  