PARQUET-1217: Incorrect handling of missing values in Statistics - #465
Merged
Merged
Conversation
In parquet-format every value in Statistics is optional while parquet-mr does not properly handle these scenarios: - null_count is set but min/max or min_value/max_value are not: filtering may fail with NPE or incorrect filtering occurs fix: check if min/max is set before comparing to the related values - null_count is not set: filtering handles null_count as if it would be 0 -> incorrect filtering may occur fix: introduce new method in Statistics object to check if num_nulls is set; check if num_nulls is set by the new method before using its value for filtering Author: Gabor Szadovszky <gabor.szadovszky@cloudera.com> Closes apache#458 from gszadovszky/PARQUET-1217 and squashes the following commits: 9d14090 [Gabor Szadovszky] Updates according to rdblue's comments 116d1d3 [Gabor Szadovszky] PARQUET-1217: Updates according to zi's comments c264b50 [Gabor Szadovszky] PARQUET-1217: fix handling of unset nullCount 2ec2fb1 [Gabor Szadovszky] PARQUET-1217: Incorrect handling of missing values in Statistics This change is based on b82d962 but is not a clean cherry-pick.
gszadovszky
force-pushed
the
PARQUET-1217_1.8.x
branch
from
April 20, 2018 06:34
5c20cef to
e1b5e70
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
In parquet-format every value in Statistics is optional while parquet-mr does not properly handle these scenarios:
fix: check if min/max is set before comparing to the related values
fix: introduce new method in Statistics object to check if num_nulls is set; check if num_nulls is set by the new method before using its value for filtering
Author: Gabor Szadovszky gabor.szadovszky@cloudera.com
Closes #458 from gszadovszky/PARQUET-1217 and squashes the following commits:
9d14090 [Gabor Szadovszky] Updates according to rdblue's comments
116d1d3 [Gabor Szadovszky] PARQUET-1217: Updates according to zi's comments
c264b50 [Gabor Szadovszky] PARQUET-1217: fix handling of unset nullCount
2ec2fb1 [Gabor Szadovszky] PARQUET-1217: Incorrect handling of missing values in Statistics
This change is based on b82d962 but is not a clean cherry-pick.