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[MINOR][SQL] Fix exception message to print string-array correctly.
## What changes were proposed in this pull request? This PR is a simple fix for an exception message to print `string[]` content correctly. ```java String[] colPath = requestedSchema.getPaths().get(i); ... - throw new IOException("Required column is missing in data file. Col: " + colPath); + throw new IOException("Required column is missing in data file. Col: " + Arrays.toString(colPath)); ``` ## How was this patch tested? Manual. Author: Dongjoon Hyun <dongjoon@apache.org> Closes #12041 from dongjoon-hyun/fix_exception_message_with_string_array.
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