wangyum opened a new pull request #28642:
URL: https://github.com/apache/spark/pull/28642
### What changes were proposed in this pull request?
We should infer `IsNotNull` for all children of `NullIntolerant`
expressions. For example:
```sql
CREATE TABLE t1(c1 string, c2 string);
CREATE TABLE t2(c1 string, c2 string);
EXPLAIN SELECT t1.* FROM t1 JOIN t2 ON coalesce(t1.c1, t1.c2)=t2.c1;
```
After this pr the query plan is:
```
== Physical Plan ==
*(5) Project [c1#23, c2#24]
+- *(5) SortMergeJoin [coalesce(c1#23, c2#24)], [c1#25], Inner
:- *(2) Sort [coalesce(c1#23, c2#24) ASC NULLS FIRST], false, 0
: +- Exchange hashpartitioning(coalesce(c1#23, c2#24), 200), true,
[id=#95]
: +- *(1) Filter isnotnull(coalesce(c1#23, c2#24))
: +- Scan hive default.t1 [c1#23, c2#24], HiveTableRelation
`default`.`t1`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [c1#23,
c2#24], Statistics(sizeInBytes=8.0 EiB)
+- *(4) Sort [c1#25 ASC NULLS FIRST], false, 0
+- Exchange hashpartitioning(c1#25, 200), true, [id=#103]
+- *(3) Filter isnotnull(c1#25)
+- Scan hive default.t2 [c1#25], HiveTableRelation
`default`.`t2`, org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, [c1#25,
c2#26], Statistics(sizeInBytes=8.0 EiB)
```
### Why are the changes needed?
Improve query performance and Hive support this optimization.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test and benchmark test.
Before this pr:
After this pr:
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