[SPARK-16334][BACKPORT] Reusing same dictionary column for decoding consecutive row groups shouldn't throw an error #14944
Conversation
This file contains 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
… row groups shouldn't throw an error This patch fixes a bug in the vectorized parquet reader that's caused by re-using the same dictionary column vector while reading consecutive row groups. Specifically, this issue manifests for a certain distribution of dictionary/plain encoded data while we read/populate the underlying bit packed dictionary data into a column-vector based data structure. Manually tested on datasets provided by the community. Thanks to Chris Perluss and Keith Kraus for their invaluable help in tracking down this issue! Author: Sameer Agarwal <sameerag@cs.berkeley.edu> Closes apache#14941 from sameeragarwal/parquet-exception-2.
|
cc @davies |
|
Test build #64883 has finished for PR 14944 at commit
|
|
seems like the failure is related to #14797? |
|
Yeah, I also hit it. |
|
retest this please |
|
Test build #64930 has finished for PR 14944 at commit
|
|
Merging this into 2.0 branch. |
asfgit
pushed a commit
that referenced
this pull request
Sep 6, 2016
…consecutive row groups shouldn't throw an error ## What changes were proposed in this pull request? Backports #14941 in 2.0. This patch fixes a bug in the vectorized parquet reader that's caused by re-using the same dictionary column vector while reading consecutive row groups. Specifically, this issue manifests for a certain distribution of dictionary/plain encoded data while we read/populate the underlying bit packed dictionary data into a column-vector based data structure. Manually tested on datasets provided by the community. Thanks to Chris Perluss and Keith Kraus for their invaluable help in tracking down this issue! Author: Sameer Agarwal <sameeragcs.berkeley.edu> Closes #14941 from sameeragarwal/parquet-exception-2. Author: Sameer Agarwal <sameerag@cs.berkeley.edu> Closes #14944 from sameeragarwal/branch-2.0.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
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.
What changes were proposed in this pull request?
Backports #14941 in 2.0.
This patch fixes a bug in the vectorized parquet reader that's caused by re-using the same dictionary column vector while reading consecutive row groups. Specifically, this issue manifests for a certain distribution of dictionary/plain encoded data while we read/populate the underlying bit packed dictionary data into a column-vector based data structure.
Manually tested on datasets provided by the community. Thanks to Chris Perluss and Keith Kraus for their invaluable help in tracking down this issue!
Author: Sameer Agarwal sameerag@cs.berkeley.edu
Closes #14941 from sameeragarwal/parquet-exception-2.