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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/02/10 10:28:52 UTC

[GitHub] [spark] HyukjinKwon opened a new pull request #27521: [SPARK-29462] The data type of "array()" should be array

HyukjinKwon opened a new pull request #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521
 
 
   ### What changes were proposed in this pull request?
   
   This brings https://github.com/apache/spark/pull/26324 back. It was reverted basically because, firstly Hive compatibility, and the lack of investigations in other DBMSes and ANSI.
   
   - In case of PostgreSQL seems coercing NULL literal to TEXT type.
   - Presto seems coercing `array() + array(1)` -> array of int.
   - Hive seems  `array() + array(1)` -> array of strings
   
    Given that, the design choices have been differently made for some reasons. If we pick one of both, seems coercing to array of int makes much more sense.
   
   Another investigation was made offline internally. Seems ANSI "SQL 2011, section 6.5 "<contextually typed value specification>" states:
   
   > If ES is specified, then let ET be the element type determined by the context in which ES appears. The declared type DT of ES is Case:
   >
   > a) If ES simply contains ARRAY, then ET ARRAY[0].
   >
   > b) If ES simply contains MULTISET, then ET MULTISET.
   >
   > ES is effectively replaced by CAST ( ES AS DT )
   
   Assuming from the investigation made, choosing to `null` seems correct, and we have a reference Presto now.
   
   Therefore, this PR proposes to bring it back.
   
   ### Why are the changes needed?
   When empty array is created, it should be declared as array<null>.
   
   ### Does this PR introduce any user-facing change?
   Yes, `array()` creates `array<null>`
   
   ### How was this patch tested?
   Tested manually

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[GitHub] [spark] dongjoon-hyun commented on a change in pull request #27521: [SPARK-29462][SQL] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
dongjoon-hyun commented on a change in pull request #27521: [SPARK-29462][SQL] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#discussion_r377270605
 
 

 ##########
 File path: docs/sql-migration-guide.md
 ##########
 @@ -215,6 +215,8 @@ license: |
   For example `SELECT timestamp 'tomorrow';`.
 
   - Since Spark 3.0, the `size` function returns `NULL` for the `NULL` input. In Spark version 2.4 and earlier, this function gives `-1` for the same input. To restore the behavior before Spark 3.0, you can set `spark.sql.legacy.sizeOfNull` to `true`.
+  
+  - Since Spark 3.0, when `array` function is called without parameters, it returns an empty array with `NullType` data type. In Spark version 2.4 and earlier, it returns an empty array with string type.
 
 Review comment:
   Before merging this, let's make it sure that we don't need to add a legacy conf for this.
   cc @gatorsmile 

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[GitHub] [spark] HyukjinKwon commented on issue #27521: [SPARK-29462] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on issue #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#issuecomment-584055797
 
 
   cc @cloud-fan, @maropu, @amanomer , @gengliangwang 

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Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#issuecomment-584066609
 
 
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[GitHub] [spark] gengliangwang commented on a change in pull request #27521: [SPARK-29462][SQL] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
gengliangwang commented on a change in pull request #27521: [SPARK-29462][SQL] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#discussion_r377278945
 
 

 ##########
 File path: docs/sql-migration-guide.md
 ##########
 @@ -215,6 +215,8 @@ license: |
   For example `SELECT timestamp 'tomorrow';`.
 
   - Since Spark 3.0, the `size` function returns `NULL` for the `NULL` input. In Spark version 2.4 and earlier, this function gives `-1` for the same input. To restore the behavior before Spark 3.0, you can set `spark.sql.legacy.sizeOfNull` to `true`.
+  
+  - Since Spark 3.0, when `array` function is called without parameters, it returns an empty array with `NullType` data type. In Spark version 2.4 and earlier, it returns an empty array with string type.
 
 Review comment:
   How about revising as 
   ```
   Since Spark 3.0, when the `array` function is called without any parameters, it returns an empty array of `NullType`. In Spark version 2.4 and earlier, it returns an empty array of string type.
   ```

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[GitHub] [spark] maropu commented on a change in pull request #27521: [SPARK-29462][SQL] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
maropu commented on a change in pull request #27521: [SPARK-29462][SQL] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#discussion_r377386840
 
 

 ##########
 File path: docs/sql-migration-guide.md
 ##########
 @@ -215,6 +215,8 @@ license: |
   For example `SELECT timestamp 'tomorrow';`.
 
   - Since Spark 3.0, the `size` function returns `NULL` for the `NULL` input. In Spark version 2.4 and earlier, this function gives `-1` for the same input. To restore the behavior before Spark 3.0, you can set `spark.sql.legacy.sizeOfNull` to `true`.
+  
+  - Since Spark 3.0, when `array` function is called without parameters, it returns an empty array with `NullType` data type. In Spark version 2.4 and earlier, it returns an empty array with string type.
 
 Review comment:
   Ur, keeping the legacy behaviour in the conf looks somewhat reasonable to me for hive users.

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[GitHub] [spark] SparkQA commented on issue #27521: [SPARK-29462] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#issuecomment-584174067
 
 
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[GitHub] [spark] HyukjinKwon commented on issue #27521: [SPARK-29462][SQL] The data type of "array()" should be array

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HyukjinKwon commented on issue #27521: [SPARK-29462][SQL] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#issuecomment-584521746
 
 
   Thank you @maropu.
   
   Merged to master and branch-3.0.

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Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/spark/pull/27521#issuecomment-584181382
 
 
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[GitHub] [spark] HyukjinKwon commented on issue #27521: [SPARK-29462] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
HyukjinKwon commented on issue #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#issuecomment-584177538
 
 
   retest this please

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[GitHub] [spark] cloud-fan commented on a change in pull request #27521: [SPARK-29462] The data type of "array()" should be array

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cloud-fan commented on a change in pull request #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#discussion_r376986725
 
 

 ##########
 File path: docs/sql-migration-guide.md
 ##########
 @@ -215,6 +215,8 @@ license: |
   For example `SELECT timestamp 'tomorrow';`.
 
   - Since Spark 3.0, the `size` function returns `NULL` for the `NULL` input. In Spark version 2.4 and earlier, this function gives `-1` for the same input. To restore the behavior before Spark 3.0, you can set `spark.sql.legacy.sizeOfNull` to `true`.
+  
+  - Since Spark 3.0, when `array` function is called without parameters, it returns an empty array with `NullType` data type. In Spark version 2.4 and earlier, the data type of the result is `StringType`.
 
 Review comment:
   `In Spark version 2.4 and earlier, it returns an empty array with string type.`

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[GitHub] [spark] cloud-fan commented on issue #27521: [SPARK-29462][SQL] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
cloud-fan commented on issue #27521: [SPARK-29462][SQL] The data type of "array()" should be array<null>
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   to be consistent, I think we should do the same thing for map. @Ngone51 can you help with it?

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[GitHub] [spark] iRakson commented on issue #27521: [SPARK-29462][SQL] The data type of "array()" should be array

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iRakson commented on issue #27521: [SPARK-29462][SQL] The data type of "array()" should be array<null>
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   @cloud-fan I will raise PR for map.

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[GitHub] [spark] HyukjinKwon closed pull request #27521: [SPARK-29462][SQL] The data type of "array()" should be array

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[GitHub] [spark] SparkQA commented on issue #27521: [SPARK-29462] The data type of "array()" should be array

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SparkQA commented on issue #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#issuecomment-584057256
 
 
   **[Test build #118151 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/118151/testReport)** for PR 27521 at commit [`5b7fad9`](https://github.com/apache/spark/commit/5b7fad93edef8f02bbe96824dd73036eaddc1ec5).

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[GitHub] [spark] AmplabJenkins commented on issue #27521: [SPARK-29462] The data type of "array()" should be array

Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27521: [SPARK-29462] The data type of "array()" should be array<null>
URL: https://github.com/apache/spark/pull/27521#issuecomment-584174563
 
 
   Test FAILed.
   Refer to this link for build results (access rights to CI server needed): 
   https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/118153/
   Test FAILed.

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