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https://issues.apache.org/jira/browse/HIVE-19256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16446845#comment-16446845
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Hive QA commented on HIVE-19256:
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|| Vote || Subsystem || Runtime || Comment ||
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue} 0m
0s{color} | {color:blue} Findbugs executables are not available. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
|| || || || {color:brown} master Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m
36s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 5m
16s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
57s{color} | {color:green} master passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 6m
27s{color} | {color:green} master passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 5m
38s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 5m
38s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
54s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 6m
58s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
14s{color} | {color:green} The patch does not generate ASF License warnings.
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| {color:black}{color} | {color:black} {color} | {color:black} 44m 3s{color} |
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|| Subsystem || Report/Notes ||
| Optional Tests | asflicense javac javadoc findbugs checkstyle compile |
| uname | Linux hiveptest-server-upstream 3.16.0-4-amd64 #1 SMP Debian
3.16.36-1+deb8u1 (2016-09-03) x86_64 GNU/Linux |
| Build tool | maven |
| Personality |
/data/hiveptest/working/yetus_PreCommit-HIVE-Build-10389/dev-support/hive-personality.sh
|
| git revision | master / 97503fb |
| Default Java | 1.8.0_111 |
| modules | C: . U: . |
| Console output |
http://104.198.109.242/logs//PreCommit-HIVE-Build-10389/yetus.txt |
| Powered by | Apache Yetus http://yetus.apache.org |
This message was automatically generated.
> UDF which shapes the input data according to the specified schema
> -----------------------------------------------------------------
>
> Key: HIVE-19256
> URL: https://issues.apache.org/jira/browse/HIVE-19256
> Project: Hive
> Issue Type: New Feature
> Components: Hive
> Affects Versions: 3.1.0
> Reporter: Ratandeep Ratti
> Assignee: Ratandeep Ratti
> Priority: Major
> Fix For: 3.1.0
>
> Attachments: HIVE-19256.patch, HIVE-19256_1.patch
>
>
> We use this UDF a lot in our org. This UDF takes an object and a Hive schema
> and make sure the output object matches the schema completely. In some
> respects it is similar to {{named
> _struct}} UDF which can be used to select columns from a struct, but it is
> more general since it can work not only on structs, but all Hive data types
> (expect union). Also the schema can provide certain valid type conversions
> (int -> double etc)
> One scenario where this is quite useful is making sure that the Hive view
> created with a specific schema will have columns which will always match that
> schema. In Hive today when a view is created, new nested columns from the
> underlying table can leak out from the view, even though the user never
> wanted this behavior. Note that this leaking of columns is only for nested
> columns and not for top level columns, so in that regard this behavior of
> Hive is inconsistent.
> Sample usage of the UDF
> {code}
> generic_project(col, "struct<a:array<struct<c:int,d:string>>>") // Returning
> data which matches the input schema. Here extra columns which are not part of
> the input will be removed
> generic_project(col, "struct<a:double>") // If the input column had a struct
> with col a as int . It would type cast 'a' to double.
> {code}
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