cloud-fan commented on a change in pull request #29587:
URL: https://github.com/apache/spark/pull/29587#discussion_r504510184
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -2740,6 +2740,19 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val UNION_BYNAME_STRUCT_SUPPORT_ENABLED =
Review comment:
I'm not sure this worths a config. It's natural that the `byName` and
`allowMissingCol` flag should apply to nested column, and these 2 flags are
newly added in the master branch so there is no backward compatibility issues.
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