Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/14946#discussion_r77561499
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala
---
@@ -263,8 +263,7 @@ class SessionCatalog(
CatalogColumn(
name = c.name,
dataType = c.dataType.catalogString,
- nullable = c.nullable,
- comment = Option(c.name)
--- End diff --
Like the existing master build, we removed this useless `comment`
attribute. The major reason is the [schema
comparison](https://github.com/apache/spark/blob/6d86403d8b252776effcddd71338b4d21a224f9b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala#L163)
also checks the comment.
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