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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/11/23 21:41:34 UTC

[GitHub] [spark] imback82 opened a new pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTable

imback82 opened a new pull request #30475:
URL: https://github.com/apache/spark/pull/30475


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   This PR proposes to improve the exception messages while `UnresolvedTableOrView` is handled based on this suggestion: https://github.com/apache/spark/pull/30321#discussion_r521127001.
   
   Currently, when an identifier is resolved to a temp view when a table/permanent view is expected, the following exception message is displayed (e.g., for `SHOW CREATE TABLE`):
   ```
   t is a temp view not table or permanent view.
   ```
   After this PR, the message will be:
   ```
   t is a temp view. 'SHOW CREATE TABLE' expects a table or permanent view.
   ```
   
   Also, if an identifier is not resolved, the following exception message is currently used:
   ```
   Table or view not found: t
   ```
   After this PR, the message will be:
   ```
   Table or permanent view not found for 'SHOW CREATE TABLE': t 
   ```
   
   ### Why are the changes needed?
   <!--
   Please clarify why the changes are needed. For instance,
     1. If you propose a new API, clarify the use case for a new API.
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   To improve the exception message.
   
   ### Does this PR introduce _any_ user-facing change?
   <!--
   Note that it means *any* user-facing change including all aspects such as the documentation fix.
   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.
   If possible, please also clarify if this is a user-facing change compared to the released Spark versions or within the unreleased branches such as master.
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   Yes, the exception message will be changed as described above.
   
   ### How was this patch tested?
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   Updated existing tests.


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[GitHub] [spark] imback82 commented on pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTableOrView

Posted by GitBox <gi...@apache.org>.
imback82 commented on pull request #30475:
URL: https://github.com/apache/spark/pull/30475#issuecomment-733505521


   retest this please


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[GitHub] [spark] SparkQA commented on pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTable

Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #30475:
URL: https://github.com/apache/spark/pull/30475#issuecomment-732443410


   **[Test build #131574 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/131574/testReport)** for PR 30475 at commit [`fd2eb37`](https://github.com/apache/spark/commit/fd2eb372642c55c4823702536c76bfd03fd1f208).


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[GitHub] [spark] cloud-fan commented on a change in pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTableOrView

Posted by GitBox <gi...@apache.org>.
cloud-fan commented on a change in pull request #30475:
URL: https://github.com/apache/spark/pull/30475#discussion_r529219203



##########
File path: sql/core/src/test/scala/org/apache/spark/sql/connector/DataSourceV2SQLSuite.scala
##########
@@ -729,7 +729,7 @@ class DataSourceV2SQLSuite
     val ex = intercept[AnalysisException] {
       sql("DROP TABLE testcat.db.notbl")
     }
-    assert(ex.getMessage.contains("Table or view not found: testcat.db.notbl"))
+    assert(ex.getMessage.contains("Table or view not found for 'DROP TABLE': testcat.db.notbl"))

Review comment:
       Sorry I don't get it. In this case, `testcat.db.notbl` is not a permanent view, but a non-existing relation.




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[GitHub] [spark] cloud-fan closed pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTableOrView

Posted by GitBox <gi...@apache.org>.
cloud-fan closed pull request #30475:
URL: https://github.com/apache/spark/pull/30475


   


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[GitHub] [spark] imback82 commented on a change in pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTableOrView

Posted by GitBox <gi...@apache.org>.
imback82 commented on a change in pull request #30475:
URL: https://github.com/apache/spark/pull/30475#discussion_r529744265



##########
File path: sql/core/src/test/scala/org/apache/spark/sql/connector/DataSourceV2SQLSuite.scala
##########
@@ -729,7 +729,7 @@ class DataSourceV2SQLSuite
     val ex = intercept[AnalysisException] {
       sql("DROP TABLE testcat.db.notbl")
     }
-    assert(ex.getMessage.contains("Table or view not found: testcat.db.notbl"))
+    assert(ex.getMessage.contains("Table or view not found for 'DROP TABLE': testcat.db.notbl"))

Review comment:
       v2 `DROP TABLE` only handles `ResolvedTable`. If it's resolved to a view, it will be handled in `ResolveSessionCatalog` and tested here:
   https://github.com/apache/spark/blob/fdd6c73b3cfac5af30c789c7f70b92367a79f7e7/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveDDLSuite.scala#L1056-L1070




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[GitHub] [spark] SparkQA commented on pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTableOrView

Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #30475:
URL: https://github.com/apache/spark/pull/30475#issuecomment-733964777


   **[Test build #131808 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/131808/testReport)** for PR 30475 at commit [`147c654`](https://github.com/apache/spark/commit/147c654408749db637825462f7324ce4629f93b6).
    * This patch **fails Spark unit tests**.
    * This patch merges cleanly.
    * This patch adds no public classes.


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[GitHub] [spark] imback82 commented on a change in pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTable

Posted by GitBox <gi...@apache.org>.
imback82 commented on a change in pull request #30475:
URL: https://github.com/apache/spark/pull/30475#discussion_r529022520



##########
File path: sql/core/src/test/scala/org/apache/spark/sql/connector/DataSourceV2SQLSuite.scala
##########
@@ -729,7 +729,7 @@ class DataSourceV2SQLSuite
     val ex = intercept[AnalysisException] {
       sql("DROP TABLE testcat.db.notbl")
     }
-    assert(ex.getMessage.contains("Table or view not found: testcat.db.notbl"))
+    assert(ex.getMessage.contains("Table or view not found for 'DROP TABLE': testcat.db.notbl"))

Review comment:
       This message could be misleading since `DROP TABLE` supports table and a temporary view. To fix this, we can add `allowPermanentView` as the following and update `Analyzer` accordingly:
   ```scala
   case class UnresolvedTableOrView(
       multipartIdentifier: Seq[String],
       commandName: String,
       allowTempView: Boolean = true,
       allowPermanentView: Boolean = true) extends LeafNode {
     require(allowTempView || allowPermanentView)
     override lazy val resolved: Boolean = false
     override def output: Seq[Attribute] = Nil
   }
   ```
   such that the exception message can be updated to
   `Table or temporary view not found for 'DROP TABLE': t`.
   
   One downside is that if `t` is resolved to a view, the message will become:
   ```
   t is a permanent view. 'DROP TABLE' expects a table or temporary view.
   ```
   instead of (current message):
   ```
   Cannot drop a view with DROP TABLE. Please use DROP VIEW instead
   ```
   , meaning it will lose the "hint" (which we can add it to `Unresolved*` if required).
   
   @cloud-fan WDYT? If you are OK with introducing `allowPermanentView`, I can do it as a separate PR.




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Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #30475:
URL: https://github.com/apache/spark/pull/30475#issuecomment-733512605


   **[Test build #131748 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/131748/testReport)** for PR 30475 at commit [`68ee277`](https://github.com/apache/spark/commit/68ee277cbde9ecb466b1480af676a2f831e11236).


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[GitHub] [spark] SparkQA commented on pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTable

Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #30475:
URL: https://github.com/apache/spark/pull/30475#issuecomment-732480246


   **[Test build #131574 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/131574/testReport)** for PR 30475 at commit [`fd2eb37`](https://github.com/apache/spark/commit/fd2eb372642c55c4823702536c76bfd03fd1f208).
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[GitHub] [spark] imback82 commented on a change in pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTableOrView

Posted by GitBox <gi...@apache.org>.
imback82 commented on a change in pull request #30475:
URL: https://github.com/apache/spark/pull/30475#discussion_r529260212



##########
File path: sql/core/src/test/scala/org/apache/spark/sql/connector/DataSourceV2SQLSuite.scala
##########
@@ -729,7 +729,7 @@ class DataSourceV2SQLSuite
     val ex = intercept[AnalysisException] {
       sql("DROP TABLE testcat.db.notbl")
     }
-    assert(ex.getMessage.contains("Table or view not found: testcat.db.notbl"))
+    assert(ex.getMessage.contains("Table or view not found for 'DROP TABLE': testcat.db.notbl"))

Review comment:
       When I read `Table or view not found for 'DROP TABLE': t`, it sounded like `DROP TABLE` also supports permanent views.
   
   So, I was suggesting `Table or temporary view not found for 'DROP TABLE': t` since `DROP TABLE` requires either a table or temporary view. But, I guess `Table or view not found` sounds better if we want to point out the non-existing relation.




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Posted by GitBox <gi...@apache.org>.
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   **[Test build #131878 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/131878/testReport)** for PR 30475 at commit [`46a4c4e`](https://github.com/apache/spark/commit/46a4c4e138c2d649889dced98caabab2db750096).


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SparkQA commented on pull request #30475:
URL: https://github.com/apache/spark/pull/30475#issuecomment-732501425


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[GitHub] [spark] cloud-fan commented on a change in pull request #30475: [SPARK-33522][SQL] Improve exception messages while handling UnresolvedTableOrView

Posted by GitBox <gi...@apache.org>.
cloud-fan commented on a change in pull request #30475:
URL: https://github.com/apache/spark/pull/30475#discussion_r529296497



##########
File path: sql/core/src/test/scala/org/apache/spark/sql/connector/DataSourceV2SQLSuite.scala
##########
@@ -729,7 +729,7 @@ class DataSourceV2SQLSuite
     val ex = intercept[AnalysisException] {
       sql("DROP TABLE testcat.db.notbl")
     }
-    assert(ex.getMessage.contains("Table or view not found: testcat.db.notbl"))
+    assert(ex.getMessage.contains("Table or view not found for 'DROP TABLE': testcat.db.notbl"))

Review comment:
       > since DROP TABLE requires either a table or temporary view
   
   Do we have such a test case for v2 DROP TABLE?




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   GA passed, merging to master, thanks!


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   retest  this please


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    * This patch **fails PySpark unit tests**.
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   retest this please


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