[GitHub] [spark] yeshengm opened a new pull request #24749: [SPARK-27890][SQL] Improve SQL parser error message when missing backquotes for identifiers with hyphens

[GitBox <gi...@apache.org>]

yeshengm opened a new pull request #24749: [SPARK-27890][SQL] Improve SQL parser error message when missing backquotes for identifiers with hyphens
URL: https://github.com/apache/spark/pull/24749
 
 
   ## What changes were proposed in this pull request?
   
   Current SQL parser's error message for hyphen-connected identifiers without surrounding backquotes(e.g. hyphen-table) is confusing for end users. A possible approach to tackle this is to explicitly capture these wrong usages in the SQL parser. In this way, the end users can fix these errors more quickly.
   
   We safely augmented the current grammar rule to explicitly capture these error cases. The error handling logic is implemented in the SQL parsing listener `PostProcessor`.
   
   ## How was this patch tested?
   Adding new unit tests.
   
   (Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests)
   (If this patch involves UI changes, please attach a screenshot; otherwise, remove this)
   
   Please review https://spark.apache.org/contributing.html before opening a pull request.
   

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