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https://issues.apache.org/jira/browse/HIVE-25845?focusedWorklogId=739263&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-739263
]
ASF GitHub Bot logged work on HIVE-25845:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 10/Mar/22 04:02
Start Date: 10/Mar/22 04:02
Worklog Time Spent: 10m
Work Description: rbalamohan opened a new pull request #3091:
URL: https://github.com/apache/hive/pull/3091
### What changes were proposed in this pull request?
Make use of columnindexes when reading parquet files. More details in
https://issues.apache.org/jira/browse/HIVE-25845
### Why are the changes needed?
To reduce IO load and improve perf.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
small internal cluster
With TPCH @ 100 GB scale (customer table has 15000000 records), here is the
query which was tried out.
Note that with patch, it reads just 11 MB of data instead of 94 MB without
patch. This will be highly beneficial for cloud stores.
select count(*) from customer where c_custkey > 14099999 and c_custkey <
14850991 limit 1000;
Without Patch:
===========
INFO : File System Counters:
..
INFO : FILE_BYTES_WRITTEN: 4703
INFO : HDFS_BYTES_READ: 94174097
...
..
With Patch:
===========
INFO : File System Counters:
....
INFO : HDFS_BYTES_READ: 11777945
...
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Issue Time Tracking
-------------------
Worklog Id: (was: 739263)
Remaining Estimate: 0h
Time Spent: 10m
> Support ColumnIndexes for Parq files
> ------------------------------------
>
> Key: HIVE-25845
> URL: https://issues.apache.org/jira/browse/HIVE-25845
> Project: Hive
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> https://issues.apache.org/jira/browse/PARQUET-1201
>
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/VectorizedParquetRecordReader.java#L271-L273]
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