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https://issues.apache.org/jira/browse/HIVE-18149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16279445#comment-16279445
]
Hive QA commented on HIVE-18149:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12900726/HIVE-18149.01.patch
{color:green}SUCCESS:{color} +1 due to 2 test(s) being added or modified.
{color:red}ERROR:{color} -1 due to 11 failed/errored test(s), 11509 tests
executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[runtime_skewjoin_mapjoin_spark]
(batchId=54)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[udf_character_length]
(batchId=38)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[udf_octet_length]
(batchId=32)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[union_view] (batchId=15)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[dynpart_sort_opt_vectorization]
(batchId=162)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[hybridgrace_hashjoin_2]
(batchId=157)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[insert_values_orig_table_use_metadata]
(batchId=165)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[sysdb]
(batchId=160)
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver[union_view]
(batchId=110)
org.apache.hadoop.hive.ql.TestAcidOnTez.testMapJoinOnTez (batchId=224)
org.apache.hadoop.hive.ql.parse.TestReplicationScenarios.testConstraints
(batchId=227)
{noformat}
Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/8117/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/8117/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-8117/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 11 tests failed
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12900726 - PreCommit-HIVE-Build
> Stats: rownum estimation from datasize underestimates in most cases
> -------------------------------------------------------------------
>
> Key: HIVE-18149
> URL: https://issues.apache.org/jira/browse/HIVE-18149
> Project: Hive
> Issue Type: Sub-task
> Components: Statistics
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Attachments: HIVE-18149.01.patch, HIVE-18149.01wip01.patch
>
>
> rownum estimation is based on the following fact as of now:
> * datasize being used from the following sources:
> ** basicstats aggregates the loaded "on-heap" row sizes ; other readers are
> able to give "raw size" estimation - I've checked orc; but I'm sure others
> will do the same....api docs are a bit vague about the methods purpose...
> ** if the basicstats level info is not available; the filesystem level
> "file-size-sums" are used as the "raw data size" ; which is multiplied by the
> [deserialization
> ratio|https://github.com/apache/hive/blob/d9924ab3e285536f7e2cc15ecbea36a78c59c66d/ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java#L261]
> ; which is currently 1.
> the problem with all of this is that deser factor is 1; and that rowsize
> counts in the online object headers..
> example; 20 rows are loaded into a partition
> [columnstats_partlvl_dp.q|https://github.com/apache/hive/blob/d9924ab3e285536f7e2cc15ecbea36a78c59c66d/ql/src/test/queries/clientpositive/columnstats_partlvl_dp.q#L7]
> after HIVE-18108 [this
> explain|https://github.com/apache/hive/blob/d9924ab3e285536f7e2cc15ecbea36a78c59c66d/ql/src/test/queries/clientpositive/columnstats_partlvl_dp.q#L25]
> will estimate the rowsize of the table to be 404 bytes; however the 20 rows
> of text is only 169 bytes...so it ends up with 0 rows...
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