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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2020/11/23 00:30:04 UTC

[GitHub] [spark] imback82 opened a new pull request #30461: [SPARK-33515][SQL] Improve exception messages while handling UnresolvedTable

imback82 opened a new pull request #30461:
URL: https://github.com/apache/spark/pull/30461


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   This PR proposes to improve the exception messages while `UnresolvedTable` is handled based on this suggestion: https://github.com/apache/spark/pull/30321#discussion_r521127001.
   
   Currently, when an identifier is resolved to a view when a table is expected, the following exception message is displayed (e.g., for `COMMENT ON TABLE`):
   ```
   v is a temp view not table.
   ```
   After this PR, the message will be:
   ```
   v is a temp view. 'COMMENT ON TABLE' expects a table.
   ```
   
   Also, if an identifier is not resolved, the following exception message is currently used:
   ```
   Table not found: t
   ```
   After this PR, the message will be:
   ```
   Table not found for 'COMMENT ON TABLE': t 
   ```
   
   ### Why are the changes needed?
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   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?
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   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.
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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 a change in pull request #30461: [SPARK-33515][SQL] Improve exception messages while handling UnresolvedTable

Posted by GitBox <gi...@apache.org>.
imback82 commented on a change in pull request #30461:
URL: https://github.com/apache/spark/pull/30461#discussion_r532098741



##########
File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
##########
@@ -1077,11 +1077,11 @@ class Analyzer(override val catalogManager: CatalogManager)
         lookupRelation(u.multipartIdentifier, u.options, u.isStreaming)
           .map(resolveViews).getOrElse(u)
 
-      case u @ UnresolvedTable(identifier) =>
+      case u @ UnresolvedTable(identifier, cmd) =>
         lookupTableOrView(identifier).map {
           case v: ResolvedView =>
             val viewStr = if (v.isTemp) "temp view" else "view"
-            u.failAnalysis(s"${v.identifier.quoted} is a $viewStr not table.")
+            u.failAnalysis(s"${v.identifier.quoted} is a $viewStr. '$cmd' expects a table.'")

Review comment:
       Thanks @MaxGekk!




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[GitHub] [spark] imback82 commented on pull request #30461: [SPARK-33515][SQL] Improve exception messages while handling UnresolvedTable

Posted by GitBox <gi...@apache.org>.
imback82 commented on pull request #30461:
URL: https://github.com/apache/spark/pull/30461#issuecomment-731963591


   @cloud-fan Please check if the new exception messages make sense. Thanks!


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Posted by GitBox <gi...@apache.org>.
cloud-fan commented on pull request #30461:
URL: https://github.com/apache/spark/pull/30461#issuecomment-732019994


   GA passed, merging to master, thanks!


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[GitHub] [spark] MaxGekk commented on a change in pull request #30461: [SPARK-33515][SQL] Improve exception messages while handling UnresolvedTable

Posted by GitBox <gi...@apache.org>.
MaxGekk commented on a change in pull request #30461:
URL: https://github.com/apache/spark/pull/30461#discussion_r532006670



##########
File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
##########
@@ -1077,11 +1077,11 @@ class Analyzer(override val catalogManager: CatalogManager)
         lookupRelation(u.multipartIdentifier, u.options, u.isStreaming)
           .map(resolveViews).getOrElse(u)
 
-      case u @ UnresolvedTable(identifier) =>
+      case u @ UnresolvedTable(identifier, cmd) =>
         lookupTableOrView(identifier).map {
           case v: ResolvedView =>
             val viewStr = if (v.isTemp) "temp view" else "view"
-            u.failAnalysis(s"${v.identifier.quoted} is a $viewStr not table.")
+            u.failAnalysis(s"${v.identifier.quoted} is a $viewStr. '$cmd' expects a table.'")

Review comment:
       `'` at the end is not needed. I will remove it in this PR: https://github.com/apache/spark/pull/30398




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[GitHub] [spark] cloud-fan closed pull request #30461: [SPARK-33515][SQL] Improve exception messages while handling UnresolvedTable

Posted by GitBox <gi...@apache.org>.
cloud-fan closed pull request #30461:
URL: https://github.com/apache/spark/pull/30461


   


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