cloud-fan commented on a change in pull request #31034:
URL: https://github.com/apache/spark/pull/31034#discussion_r556372999
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File path: docs/sql-migration-guide.md
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@@ -32,6 +32,8 @@ license: |
- In Spark 3.2, script transform default FIELD DELIMIT is `\u0001` for no
serde mode. In Spark 3.1 or earlier, the default FIELD DELIMIT is `\t`.
+ - In Spark 3.2, the auto-generated `Cast` which is introduced by Spark will
be stripped. E.g., The default column name of `SELECT floor(1)` will be
`FLOOR(1)` instead of `FLOOR(CAST(1 AS DOUBLE))`.
Review comment:
let's be more clear:
```
.. the auto-generated `Cast` (such as those added by type coercion rules)
will be stripped when
generating column alias names. E.g., `sql("SELECT floor(1)").columns` will
be `FLOOR(1)`
instead of `FLOOR(CAST(1 AS DOUBLE))`
```
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