Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/22124#discussion_r211183300
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -384,7 +384,12 @@ object RemoveRedundantAliases extends
Rule[LogicalPlan] {
}
}
- def apply(plan: LogicalPlan): LogicalPlan = removeRedundantAliases(plan,
AttributeSet.empty)
+ def apply(plan: LogicalPlan): LogicalPlan = {
+ plan match {
+ case c: Command => c
+ case _ => removeRedundantAliases(plan, AttributeSet.empty)
--- End diff --
I don't get it. For the query
```
*(1) Project [col1#8L AS COL1#14L, col2#9L AS COL2#15L]
+- *(1) Filter (isnotnull(col1#8L) && (col1#8L > -20))
+- *(1) FileScan parquet default.table1[col1#8L,col2#9L] Batched: true,
Format: Parquet, Location: InMemoryFileIndex[file:/tmp/yumwang/spark/parquet],
PartitionFilters: [], PushedFilters: [IsNotNull(col1), GreaterThan(col1,-20)],
ReadSchema: struct<col1:bigint,col2:bigint>
```
Why is the alias treated as redundant? The name does change, isn't it?
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