import org.apache.calcite.sql.parser.SqlParserImplFactory; //导入依赖的package包/类
@Override
public SqlParserImplFactory parserFactory() {
  if (supportFullyQualifiedProjections) {
    return ParserImpl.FACTORY;
  }
  return ParserWithCompoundIdConverter.FACTORY;
}
 

import org.apache.calcite.sql.parser.SqlParserImplFactory; //导入依赖的package包/类
@Override protected Function0<CalcitePrepare> createPrepareFactory() {
  return new Function0<CalcitePrepare>() {
    @Override public CalcitePrepare apply() {
      return new CalcitePrepareImpl() {
        @Override protected SqlParser.ConfigBuilder createParserConfig() {
          return super.createParserConfig().setParserFactory(
              new SqlParserImplFactory() {
                @Override public SqlAbstractParserImpl
                getParser(Reader stream) {
                  return new SqlParserImpl(stream) {
                    @Override public SqlNode parseSqlStmtEof() {
                      return new SqlCall(SqlParserPos.ZERO) {
                        @Override public SqlOperator getOperator() {
                          return new SqlSpecialOperator("COMMIT",
                              SqlKind.COMMIT);
                        }

                        @Override public List<SqlNode> getOperandList() {
                          return ImmutableList.of();
                        }
                      };
                    }
                  };
                }
              });
        }

        @Override public void executeDdl(Context context, SqlNode node) {
          ++counter;
        }
      };
    }
  };
}
 

import org.apache.calcite.sql.parser.SqlParserImplFactory; //导入依赖的package包/类
@Override
public SqlParserImplFactory parserFactory() {
  return DrillParserWithCompoundIdConverter.FACTORY;
}
 

import org.apache.calcite.sql.parser.SqlParserImplFactory; //导入依赖的package包/类
@Override protected SqlParserImplFactory parserImplFactory() {
  return SqlDdlParserImpl.FACTORY;
}
 

import org.apache.calcite.sql.parser.SqlParserImplFactory; //导入依赖的package包/类
@Override protected SqlParserImplFactory parserImplFactory() {
  return ExtensionSqlParserImpl.FACTORY;
}