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[GitHub] [spark] cloud-fan opened a new pull request #27926:
[SPARK-31166][SQL] UNION map and other maps should not fail
cloud-fan opened a new pull request #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926
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After https://github.com/apache/spark/pull/27542, `map()` returns `map<null, null>` instead of `map<string, string>`. However, this breaks queries which union `map()` and other maps.
The reason is, `TypeCoercion` rules and `Cast` think it's illegal to cast null type map key to other types, as it makes the key nullable, but it's actually legal. This PR fixes it.
### Why are the changes needed?
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To avoid breaking queries.
### Does this PR introduce any user-facing change?
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If yes, please clarify the previous behavior and the change this PR proposes - provide the console output, description and/or an example to show the behavior difference if possible.
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Yes, now some queries that work in 2.x can work in 3.0 as well.
### How was this patch tested?
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new test
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[GitHub] [spark] SparkQA removed a comment on issue #27926:
[SPARK-31166][SQL] UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
SparkQA removed a comment on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599611886
**[Test build #119875 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/119875/testReport)** for PR 27926 at commit [`125d094`](https://github.com/apache/spark/commit/125d09408edcbee3a5bae591e949c53c90878ca7).
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[GitHub] [spark] SparkQA commented on issue #27926: [SPARK-31166][SQL] UNION
map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599611886
**[Test build #119875 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/119875/testReport)** for PR 27926 at commit [`125d094`](https://github.com/apache/spark/commit/125d09408edcbee3a5bae591e949c53c90878ca7).
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[SPARK-31166][SQL] UNION map and other maps should not fail
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UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599749454
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[GitHub] [spark] cloud-fan closed pull request #27926: [SPARK-31166][SQL]
UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
cloud-fan closed pull request #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926
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[GitHub] [spark] cloud-fan commented on issue #27926: [SPARK-31166][SQL]
UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599610977
cc @maropu @HyukjinKwon
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UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599612796
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UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
AmplabJenkins commented on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599749462
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[GitHub] [spark] maropu commented on a change in pull request #27926:
[SPARK-31166][SQL] UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
maropu commented on a change in pull request #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#discussion_r393389988
##########
File path: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala
##########
@@ -3487,6 +3487,12 @@ class SQLQuerySuite extends QueryTest with SharedSparkSession with AdaptiveSpark
}
}
}
+
+ test("SPARK-31166: UNION map<null, null> and other maps should not fail") {
+ checkAnswer(
+ sql("(SELECT map()) UNION ALL (SELECT map(1, 2))"),
+ Seq(Row(Map[Int, Int]()), Row(Map(1 -> 2))))
+ }
Review comment:
Nice catch! It seems #27542 broke some other queries merging `map<null,null>` and `map<some type, some type>`, e.g., `map_concat`;
```
// the current master
scala> sql("select map_concat(map(), map(1, 2))").show()
org.apache.spark.sql.AnalysisException: cannot resolve 'map_concat(map(), map(1, 2))' due to data type mismatch: input to function map_concat should all be the same type, but it's [map<null,null>, map<int,int>]; line 1 pos 7;
'Project [unresolvedalias(map_concat(map(), map(1, 2)), None)]
+- OneRowRelation
at org.apache.spark.sql.catalyst.analysis.package$AnalysisErrorAt.failAnalysis(package.scala:42)
```
This PR can fix this query, too.
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[GitHub] [spark] SparkQA commented on issue #27926: [SPARK-31166][SQL] UNION
map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
SparkQA commented on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599748721
**[Test build #119875 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/119875/testReport)** for PR 27926 at commit [`125d094`](https://github.com/apache/spark/commit/125d09408edcbee3a5bae591e949c53c90878ca7).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds no public classes.
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[GitHub] [spark] cloud-fan commented on issue #27926: [SPARK-31166][SQL]
UNION map and other maps should not fail
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on issue #27926: [SPARK-31166][SQL] UNION map<null, null> and other maps should not fail
URL: https://github.com/apache/spark/pull/27926#issuecomment-599866187
thanks for review, merging to master/3.0!
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UNION map and other maps should not fail
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