baremaps-calcite/src/main/java/org/apache/baremaps/calcite/BaremapsDdlExecutor.java [155:171]:
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  static SqlNode renameColumns(@Nullable SqlNodeList columnList,
      SqlNode query) {
    if (columnList == null) {
      return query;
    }
    final SqlParserPos p = query.getParserPosition();
    final SqlNodeList selectList = SqlNodeList.SINGLETON_STAR;
    final SqlCall from =
        SqlStdOperatorTable.AS.createCall(p,
            ImmutableList.<SqlNode>builder()
                .add(query)
                .add(new SqlIdentifier("_", p))
                .addAll(columnList)
                .build());
    return new SqlSelect(p, null, selectList, from, null, null, null, null,
        null, null, null, null, null);
  }
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baremaps-calcite/src/main/java/org/apache/baremaps/calcite/postgres/PostgresDdlExecutor.java [183:199]:
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  static SqlNode renameColumns(@Nullable SqlNodeList columnList,
      SqlNode query) {
    if (columnList == null) {
      return query;
    }
    final SqlParserPos p = query.getParserPosition();
    final SqlNodeList selectList = SqlNodeList.SINGLETON_STAR;
    final SqlCall from =
        SqlStdOperatorTable.AS.createCall(p,
            ImmutableList.<SqlNode>builder()
                .add(query)
                .add(new SqlIdentifier("_", p))
                .addAll(columnList)
                .build());
    return new SqlSelect(p, null, selectList, from, null, null, null, null,
        null, null, null, null, null);
  }
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