presto-parquet/src/main/java/io/prestosql/parquet/ParquetTypeUtils.java/ParquetTypeUtils/lookupColumnByName
class ParquetTypeUtils:    public static ColumnIO lookupColumnByName(GroupColumnIO groupColumnIO, String columnName)
    {
        ColumnIO columnIO = groupColumnIO.getChild(columnName);

        if (columnIO != null) {
            return columnIO;
        }

        for (int i = 0; i < groupColumnIO.getChildrenCount(); i++) {
            if (groupColumnIO.getChild(i).getName().equalsIgnoreCase(columnName)) {
                return groupColumnIO.getChild(i);
            }
        }

        return null;
    }