michTalebzadeh commented on PR #47522:
URL: https://github.com/apache/spark/pull/47522#issuecomment-2303087669
When encountering mixed schema rows, the current error message "{actual} is
not a valid external type for schema of {expected}" lacks sufficient detail to
identify the problematic column. This ambiguity hinders troubleshooting and
increases development time.
To enhance error clarity, we propose incorporating the source column name
into the error message. For example: "Column 'my_column' has an actual type of
{actual} which is not a valid external type for the expected schema of
{expected}."
By providing this additional context, developers can more efficiently
pinpoint and resolve schema mismatches.
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