wangyum opened a new pull request #30852:
URL: https://github.com/apache/spark/pull/30852
### What changes were proposed in this pull request?
This pr replace None of elseValue inside `CaseWhen` with `FalseLiteral` if
all branches are `FalseLiteral` . The use case is:
```sql
create table t1 using parquet as select id from range(10);
explain select id from t1 where (CASE WHEN id = 1 THEN 'a' WHEN id = 3 THEN
'b' end) = 'c';
```
Before this pr:
```
== Physical Plan ==
*(1) Filter CASE WHEN (id#1L = 1) THEN false WHEN (id#1L = 3) THEN false END
+- *(1) ColumnarToRow
+- FileScan parquet default.t1[id#1L] Batched: true, DataFilters: [CASE
WHEN (id#1L = 1) THEN false WHEN (id#1L = 3) THEN false END], Format: Parquet,
Location:
InMemoryFileIndex[file:/Users/yumwang/opensource/spark/spark-warehouse/org.apache.spark.sql.DataF...,
PartitionFilters: [], PushedFilters: [], ReadSchema: struct<id:bigint>
```
After this pr:
```
== Physical Plan ==
LocalTableScan <empty>, [id#1L]
```
### Why are the changes needed?
Improve query performance.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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