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| author | Wenchen Fan <wenchen@databricks.com> | 2016-01-31 22:43:03 -0800 |
|---|---|---|
| committer | Davies Liu <davies.liu@gmail.com> | 2016-01-31 22:43:03 -0800 |
| commit | c1da4d421ab78772ffa52ad46e5bdfb4e5268f47 (patch) | |
| tree | da4be6e0c6142592d845daa5bc0928b7000c3769 /core | |
| parent | 5a8b978fabb60aa178274f86432c63680c8b351a (diff) | |
| download | spark-c1da4d421ab78772ffa52ad46e5bdfb4e5268f47.tar.gz spark-c1da4d421ab78772ffa52ad46e5bdfb4e5268f47.tar.bz2 spark-c1da4d421ab78772ffa52ad46e5bdfb4e5268f47.zip | |
[SPARK-13093] [SQL] improve null check in nullSafeCodeGen for unary, binary and ternary expression
The current implementation is sub-optimal:
* If an expression is always nullable, e.g. `Unhex`, we can still remove null check for children if they are not nullable.
* If an expression has some non-nullable children, we can still remove null check for these children and keep null check for others.
This PR improves this by making the null check elimination more fine-grained.
Author: Wenchen Fan <wenchen@databricks.com>
Closes #10987 from cloud-fan/null-check.
Diffstat (limited to 'core')
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