sarutak opened a new pull request #33380:
URL: https://github.com/apache/spark/pull/33380
### What changes were proposed in this pull request?
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This PR change the behavior of the quoted interval literal like `SELECT
INTERVAL '1 year 2 month'` to be converted to ANSI interval types.
### Why are the changes needed?
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The tnit-to-unit interval literals and the unit list interval literals are
converted to ANSI interval types but quoted interval literals are still
converted to CalendarIntervalType.
```
-- Unit list interval literals
spark-sql> select interval 1 year 2 month;
1-2
-- Quoted interval literals
spark-sql> select interval '1 year 2 month';
1 years 2 months
```
### Does this PR introduce _any_ user-facing change?
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the documentation fix.
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Yes but the following sentence in `sql-migration-guide.md` seems to cover
this change.
```
- In Spark 3.2, the unit list interval literals can not mix year-month
fields (YEAR and MONTH) and day-time fields (WEEK, DAY, ..., MICROSECOND).
For example, `INTERVAL 1 day 1 hour` is invalid in Spark 3.2. In Spark 3.1
and earlier,
there is no such limitation and the literal returns value of
`CalendarIntervalType`.
To restore the behavior before Spark 3.2, you can set
`spark.sql.legacy.interval.enabled` to `true`.
```
### How was this patch tested?
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Modified existing tests and add new tests.
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