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Posted to gitbox@hive.apache.org by GitBox <gi...@apache.org> on 2021/03/10 07:31:27 UTC
[GitHub] [hive] kasakrisz opened a new pull request #2056: HIVE-24865: Implement Respect/Ignore Nulls in first/last_value
kasakrisz opened a new pull request #2056:
URL: https://github.com/apache/hive/pull/2056
### What changes were proposed in this pull request?
1. Introduce `RESPECT NULLS` `IGNORE NULLS` syntax and map it to boolean values.
2. Treat this value as a boolean parameter of the specified window function.
3. `first/last_value` functions already supports this extra parameter.
### Why are the changes needed?
Support specifying ignore nulls in a standard way.
### Does this PR introduce _any_ user-facing change?
Yes, but existing behavior not changed. Ignore nulls can be specified two ways:
```
Standard: select last_value(b) ignore nulls over
Legacy: select last_value(b, true) over
```
### How was this patch tested?
```
mvn test -Dtest.output.overwrite -DskipSparkTests -Dtest=TestMiniLlapLocalCliDriver -Dqfile=windowing_navfn.q -pl itests/qtest -Pitests
```
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[GitHub] [hive] kasakrisz closed pull request #2056: HIVE-24865: Implement Respect/Ignore Nulls in first/last_value
Posted by GitBox <gi...@apache.org>.
kasakrisz closed pull request #2056:
URL: https://github.com/apache/hive/pull/2056
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[GitHub] [hive] kasakrisz commented on pull request #2056: HIVE-24865: Implement Respect/Ignore Nulls in first/last_value
Posted by GitBox <gi...@apache.org>.
kasakrisz commented on pull request #2056:
URL: https://github.com/apache/hive/pull/2056#issuecomment-795917263
Trying a different approach to populate ignore nulls properties in Calcite plan: #2060
Closing this
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