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Posted to gitbox@hive.apache.org by "ngsg (via GitHub)" <gi...@apache.org> on 2024/04/11 05:24:39 UTC
[PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
ngsg opened a new pull request, #5191:
URL: https://github.com/apache/hive/pull/5191
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This patch preserves column stats when applying UDF `upper`/`lower` on a column.
### Why are the changes needed?
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1. If you propose a new API, clarify the use case for a new API.
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Current Hive re-estimates column stats when it encounters UDF. UDF `upper` and `lower` do not change column stats, but current Hive resets `avgColLen` to `hive.stats.max.variable.length`. Keeping the input data's column stats, including `avgColLen`, will give more accurate stats to later query optimizers and make a better query plan.
### Does this PR introduce _any_ user-facing change?
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No
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No
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Added a qfile for testing column stats computation on upper/lower UDF. Current Hive chooses MergeJoin due to column stats over-estimation, while this patch chooses MapJoin.
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "okumin (via GitHub)" <gi...@apache.org>.
okumin commented on code in PR #5191:
URL: https://github.com/apache/hive/pull/5191#discussion_r1565852758
##########
ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java:
##########
@@ -1736,6 +1749,13 @@ private static boolean isWideningCast(ExprNodeGenericFuncDesc engfd) {
engfd.getTypeInfo());
}
+ private static boolean isColStatsReusableFunc(ExprNodeGenericFuncDesc engfd) {
+ GenericUDF udf = engfd.getGenericUDF();
+ Class udfClass =
+ (udf instanceof GenericUDFBridge) ? ((GenericUDFBridge)udf).getUdfClass() : udf.getClass();
+ return udfClass == GenericUDFLower.class || udfClass == GenericUDFUpper.class;
Review Comment:
I like this PR. I have also observed that an estimation was wrong, and Map Join was disabled.
We implement some estimation APIs on the UDF side. I'll share examples with you. This is not a strong suggestion, and the current implementation seems to be a good starting point. We may finally need a pluggable I/F to empower custom UDFs more.
- https://github.com/apache/hive/blob/rel/release-4.0.0/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/NDV.java
- https://github.com/apache/hive/blob/rel/release-4.0.0/ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDAFEvaluator.java#L63-L81
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2049058390
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [13 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2068473576
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [2 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 [0 Accepted issues](https://sonarcloud.io/component_measures?id=apache_hive&pullRequest=5191&metric=new_accepted_issues&view=list)
Measures
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "deniskuzZ (via GitHub)" <gi...@apache.org>.
deniskuzZ commented on code in PR #5191:
URL: https://github.com/apache/hive/pull/5191#discussion_r1568783021
##########
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFLower.java:
##########
@@ -108,4 +114,14 @@ public String getDisplayString(String[] children) {
return getStandardDisplayString("lower", children);
}
+ @Override
+ public StatEstimator getStatEstimator() {
+ return new StatEstimator() {
+ @Override
+ public Optional<ColStatistics> estimate(List<ColStatistics> argStats) {
+ return Optional.of(argStats.get(0).clone());
Review Comment:
could it be an empty list?
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2067366526
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [2 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 [0 Accepted issues](https://sonarcloud.io/component_measures?id=apache_hive&pullRequest=5191&metric=new_accepted_issues&view=list)
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2060305300
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [5 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 [0 Accepted issues](https://sonarcloud.io/component_measures?id=apache_hive&pullRequest=5191&metric=new_accepted_issues&view=list)
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "okumin (via GitHub)" <gi...@apache.org>.
okumin commented on code in PR #5191:
URL: https://github.com/apache/hive/pull/5191#discussion_r1568759804
##########
ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java:
##########
@@ -1736,6 +1749,13 @@ private static boolean isWideningCast(ExprNodeGenericFuncDesc engfd) {
engfd.getTypeInfo());
}
+ private static boolean isColStatsReusableFunc(ExprNodeGenericFuncDesc engfd) {
+ GenericUDF udf = engfd.getGenericUDF();
+ Class udfClass =
+ (udf instanceof GenericUDFBridge) ? ((GenericUDFBridge)udf).getUdfClass() : udf.getClass();
+ return udfClass == GenericUDFLower.class || udfClass == GenericUDFUpper.class;
Review Comment:
I didn't know the interface and looks super nice!
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2060743845
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [2 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 [0 Accepted issues](https://sonarcloud.io/component_measures?id=apache_hive&pullRequest=5191&metric=new_accepted_issues&view=list)
Measures
 [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 No data about Coverage
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[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191)
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "zhangbutao (via GitHub)" <gi...@apache.org>.
zhangbutao commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2061588240
> LGTM +1, pending tests note: mv_iceberg_orc5 fails in master as well, looks like flaky
`mv_iceberg_orc5.q` is flaky. Please see https://issues.apache.org/jira/browse/HIVE-28203
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2068777158
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2068080068
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [2 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 [0 Accepted issues](https://sonarcloud.io/component_measures?id=apache_hive&pullRequest=5191&metric=new_accepted_issues&view=list)
Measures
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2075398541
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [2 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 [0 Accepted issues](https://sonarcloud.io/component_measures?id=apache_hive&pullRequest=5191&metric=new_accepted_issues&view=list)
Measures
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "deniskuzZ (via GitHub)" <gi...@apache.org>.
deniskuzZ commented on code in PR #5191:
URL: https://github.com/apache/hive/pull/5191#discussion_r1568783021
##########
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFLower.java:
##########
@@ -108,4 +114,14 @@ public String getDisplayString(String[] children) {
return getStandardDisplayString("lower", children);
}
+ @Override
+ public StatEstimator getStatEstimator() {
+ return new StatEstimator() {
+ @Override
+ public Optional<ColStatistics> estimate(List<ColStatistics> argStats) {
+ return Optional.of(argStats.get(0).clone());
Review Comment:
could it be an empty list?
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "deniskuzZ (via GitHub)" <gi...@apache.org>.
deniskuzZ merged PR #5191:
URL: https://github.com/apache/hive/pull/5191
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "ngsg (via GitHub)" <gi...@apache.org>.
ngsg commented on code in PR #5191:
URL: https://github.com/apache/hive/pull/5191#discussion_r1568322246
##########
ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java:
##########
@@ -1736,6 +1749,13 @@ private static boolean isWideningCast(ExprNodeGenericFuncDesc engfd) {
engfd.getTypeInfo());
}
+ private static boolean isColStatsReusableFunc(ExprNodeGenericFuncDesc engfd) {
+ GenericUDF udf = engfd.getGenericUDF();
+ Class udfClass =
+ (udf instanceof GenericUDFBridge) ? ((GenericUDFBridge)udf).getUdfClass() : udf.getClass();
+ return udfClass == GenericUDFLower.class || udfClass == GenericUDFUpper.class;
Review Comment:
Thanks for sharing the examples. I moved the estimation logic to UDF side by using `StatEstimatorProvider` interface.
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Re: [PR] HIVE-28196: Preserve column stats when applying UDF upper/lower [hive]
Posted by "sonarcloud[bot] (via GitHub)" <gi...@apache.org>.
sonarcloud[bot] commented on PR #5191:
URL: https://github.com/apache/hive/pull/5191#issuecomment-2064466439
## [](https://sonarcloud.io/dashboard?id=apache_hive&pullRequest=5191) **Quality Gate passed**
Issues
 [2 New issues](https://sonarcloud.io/project/issues?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 [0 Accepted issues](https://sonarcloud.io/component_measures?id=apache_hive&pullRequest=5191&metric=new_accepted_issues&view=list)
Measures
 [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=apache_hive&pullRequest=5191&resolved=false&inNewCodePeriod=true)
 No data about Coverage
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