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[SPARK-24640][SQL][FOLLOWUP] Update the SQL migration guide about size(NULL) #26066

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[SPARK-24640][SQL][FOLLOWUP] Update the SQL migration guide about size(NULL) #26066

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4 changes: 3 additions & 1 deletion docs/sql-migration-guide.md
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Expand Up @@ -213,7 +213,9 @@ license: |
- `yesterday [zoneId]` - midnight yesterday
- `tomorrow [zoneId]` - midnight tomorrow
- `now` - current query start time
For example `SELECT timestamp 'tomorrow';`.
For example `SELECT timestamp 'tomorrow';`.

- Since Spark 3.0, the `size` function returns `NULL` for the `NULL` input. In Spark version 2.4 and earlier, this function gives `-1` for the same input. To restore the behavior before Spark 3.0, you can set `spark.sql.legacy.sizeOfNull` to `true`.

## Upgrading from Spark SQL 2.4 to 2.4.1

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