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https://issues.apache.org/jira/browse/PARQUET-1061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16092409#comment-16092409
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Junjie Chen edited comment on PARQUET-1061 at 7/19/17 12:42 AM:
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Yes, I already set parquet.filter.dictionary.enabled to true.
ParquetFileReader#filterRowGroup is called in
ParquetRecordReader#initializeInternalReader. while in
initializeInternalReader, filterRowGroup will be called when (*rowGroupoffset
== null*).
If rowGroupOffset == null means no row group in split(am I right?), so the call
is wrong here.
was (Author: junjie):
Yes, I already set parquet.filter.dictionary.enabled to true.
ParquetFileReader#filterRowGroup is called in
ParquetRecordReader#initializeInternalReader. while in
initializeInternalReader, filterRowGroup will be called when (*rowGroupoffset
== null*). And if rowGroupOffset == null means no row group in split(am I
right?), so the call is wrong here.
> parquet dictionary filter does not work.
> ----------------------------------------
>
> Key: PARQUET-1061
> URL: https://issues.apache.org/jira/browse/PARQUET-1061
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Affects Versions: 1.9.0
> Environment: Hive 2.2.0 + Parquet-mr 1.9.0/master
> Reporter: Junjie Chen
>
> When perform selective query, we observed that dictionary filter was not
> applied. Please see following code snippet.
> if (rowGroupOffsets != null) {
> // verify a row group was found for each offset
> List<BlockMetaData> blocks = reader.getFooter().getBlocks();
> if (blocks.size() != rowGroupOffsets.length) {
> throw new IllegalStateException(
> "All of the offsets in the split should be found in the file."
> + " expected: " + Arrays.toString(rowGroupOffsets)
> + " found: " + blocks);
> }
> } else {
> *Why apply data filter when row group offset equal to null? *
> // apply data filters
> reader.filterRowGroups(getFilter(configuration));
> }
> I can enable filter after move else block code into second layer if.
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