[GitHub] [spark] cloud-fan opened a new pull request #24721: [SPARK-27856][SQL] do not forcibly add cast when inserting table

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

cloud-fan opened a new pull request #24721: [SPARK-27856][SQL] do not forcibly add cast when inserting table
URL: https://github.com/apache/spark/pull/24721
 
 
   ## What changes were proposed in this pull request?
   
   When inserting data to a data source v1 table, Spark will forcibly cast the data type of input query to the data type of target table. This can be super confusing if users make a mistake and write string values to an int column. Users will get no error/warning and see null values in the target table.
   
   It's more reasonable to follow the behavior of data source v2 tables, which only allows "upcast", e.g. `int -> long`, `int -> string`, not `long -> int`, `string -> int`.
   
   ## How was this patch tested?
   
   new tests

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