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https://issues.apache.org/jira/browse/HIVE-26147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17524372#comment-17524372
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Karen Coppage commented on HIVE-26147:
--------------------------------------
Committed to master branch. Thanks for your contribution [~asolimando] !
> OrcRawRecordMerger throws NPE when hive.acid.key.index is missing for an acid
> file
> ----------------------------------------------------------------------------------
>
> Key: HIVE-26147
> URL: https://issues.apache.org/jira/browse/HIVE-26147
> Project: Hive
> Issue Type: Bug
> Components: ORC, Transactions
> Affects Versions: 4.0.0-alpha-2
> Reporter: Alessandro Solimando
> Assignee: Alessandro Solimando
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> When _hive.acid.key.index_ is missing for an acid ORC file
> _OrcRawRecordMerger_ throws as follows:
> {noformat}
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.io.orc.OrcRawRecordMerger.discoverKeyBounds(OrcRawRecordMerger.java:795)
> ~[hive-exec-4.0.0-alpha-2-SNAPS
> HOT.jar:4.0.0-alpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.io.orc.OrcRawRecordMerger.<init>(OrcRawRecordMerger.java:1053)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.
> 0.0-alpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.io.orc.OrcInputFormat.getReader(OrcInputFormat.java:2096)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-a
> lpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.io.orc.OrcInputFormat.getRecordReader(OrcInputFormat.java:1991)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4
> .0.0-alpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.FetchOperator$FetchInputFormatSplit.getRecordReader(FetchOperator.java:769)
> ~[hive-exec-4.0.0-alpha
> -2-SNAPSHOT.jar:4.0.0-alpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.FetchOperator.getRecordReader(FetchOperator.java:335)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-
> alpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:560)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-alpha
> -2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:529)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-alpha-2-
> SNAPSHOT]
> at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:150)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-alpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.Driver.getFetchingTableResults(Driver.java:719)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-alpha-2-SNA
> PSHOT]
> at org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:671)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-alpha-2-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.getResults(ReExecDriver.java:233)
> ~[hive-exec-4.0.0-alpha-2-SNAPSHOT.jar:4.0.0-alpha
> -2-SNAPSHOT]
> at
> org.apache.hive.service.cli.operation.SQLOperation.getNextRowSet(SQLOperation.java:489)
> ~[hive-service-4.0.0-alpha-2-SNAPSHOT.jar:
> 4.0.0-alpha-2-SNAPSHOT]
> ... 24 more
> {noformat}
> For this situation to happen, the ORC file must have more than one stripe,
> and the offset of the element to seek should either locate it beyond the
> first stripe (but before the last one), or in the first one if not the last
> one, as the code shows:
> {code:java}
> if (firstStripe != 0) {
> minKey = keyIndex[firstStripe - 1];
> }
> if (!isTail) {
> maxKey = keyIndex[firstStripe + stripeCount - 1];
> }
> {code}
> However, in the context of the detection of the original issue, the NPE was
> triggered even by a simple "select *" over a table with ORC files missing the
> _hive.acid.key.index_ metadata information, but it was never failing for ORC
> files with a single stripe. The file was generated after a major compaction
> of acid and non-acid data.
> If the "select *" is not triggering the NPE, either pick the values of the
> row obtained with "select * from $table limit 1", or try to select based on
> different values trying to get into the sought situation with a filter like
> this:
> {code:sql}
> select * from $table where c = $value
> {code}
> _OrcRawRecordMerger_ should simply leave as "null" the min and max keys when
> the _hive.acid.key.index_ metadata is missing.
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