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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/10/25 15:33:32 UTC
[GitHub] [spark] MaxGekk opened a new pull request #26256:
[WIP][SPARK-29605][SQL] Optimize string to interval casting
MaxGekk opened a new pull request #26256: [WIP][SPARK-29605][SQL] Optimize string to interval casting
URL: https://github.com/apache/spark/pull/26256
### What changes were proposed in this pull request?
In the PR, I propose new function `stringToInterval()` in `IntervalUtils` for converting `UTF8String` to `CalendarInterval`. The function is used in casting a `STRING` column to an `INTERVAL` column.
### Why are the changes needed?
The proposed implementation is ~10 times faster. For example, parsing 9 interval units on JDK 8:
Before:
```
9 units w/ interval 14004 14125 116 0.1 14003.6 0.0X
9 units w/o interval 13785 14056 290 0.1 13784.9 0.0X
```
After:
```
9 units w/ interval 1343 1344 1 0.7 1343.0 0.3X
9 units w/o interval 1345 1349 8 0.7 1344.6 0.3X
```
### Does this PR introduce any user-facing change?
No
### How was this patch tested?
- By new tests for `stringToInterval` in `IntervalUtilsSuite`
- By existing tests
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