Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21080#discussion_r181953816
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -575,7 +575,7 @@ class CodegenContext {
if (freshNameIds.contains(fullName)) {
val id = freshNameIds(fullName)
freshNameIds(fullName) = id + 1
- s"$fullName$id"
+ s"${fullName}_$id"
} else {
freshNameIds += fullName -> 1
fullName
--- End diff --
Hmm, doesn't it be
`a_1` -> `a_1_0`
`a` -> `a_0`
`a` -> `a_1`
?
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