wuyi created SPARK-30151:
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Summary: Issue better error message when user-specified schema not
match relation schema
Key: SPARK-30151
URL: https://issues.apache.org/jira/browse/SPARK-30151
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: wuyi
In DataSource.resolveRelation(), when relation schema does not match
user-specified schema, it raises exception and says that "$className does not
allow user-specified schemas." However, it does allow user-specified schema if
it matches relation schema. Instead, we should issue a better error message to
tell user what is really happening here, e.g. clarify the mismatched fields to
user.
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