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[SPARK-38211][SQL][DOCS] Add SQL migration guide on restoring loose u…
…pcast from string to other types ### What changes were proposed in this pull request? Add doc on restoring loose upcast from string to other types (behavior before 2.4.1) to SQL migration guide. ### Why are the changes needed? After [SPARK-24586](https://issues.apache.org/jira/browse/SPARK-24586), loose upcasting from string to other types are not allowed by default. User can still set `spark.sql.legacy.looseUpcast=true` to restore old behavior but it's not documented. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Only doc change. Closes #35519 from manuzhang/spark-38211. Authored-by: tianlzhang <tianlzhang@ebay.com> Signed-off-by: Hyukjin Kwon <gurwls223@apache.org> (cherry picked from commit 78514e3) Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>
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