ggershinsky commented on a change in pull request #925:
URL: https://github.com/apache/parquet-mr/pull/925#discussion_r700791993
##########
File path:
parquet-hadoop/src/main/java/org/apache/parquet/format/converter/ParquetMetadataConverter.java
##########
@@ -1254,14 +1276,41 @@ static FileMetaData
filterFileMetaDataByMidpoint(FileMetaData metaData, RangeMet
return metaData;
}
+ private static long tryUseFileOffset(RowGroup rowGroup, long preStartIndex,
long preCompressedSize) {
+ long startIndex = 0;
+ startIndex = rowGroup.getFile_offset();
+ // skip checking the first rowGroup
+ // (in case of summary file, there are multiple first groups from
different footers)
+ if (preStartIndex != 0 && preStartIndex <= startIndex) {
+
+ //calculate start index for other blocks
+ long minStartIndex = preStartIndex + preCompressedSize;
+ if (startIndex < minStartIndex) {
+ // a bad offset detected, try first column's offset
+ // can not use minStartIndex in case of padding
+ startIndex = getOffset(rowGroup.getColumns().get(0));
Review comment:
and of course, I'm fine with your proposal to change the order - if you
can detect the "encrypted footer" mode (eg by checking one
columnChunk.isSetMeta_data()), then its ok to start with using first columns's
offset
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