gengliangwang commented on code in PR #37256:
URL: https://github.com/apache/spark/pull/37256#discussion_r931552510
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -2914,7 +2914,10 @@ object SQLConf {
buildConf("spark.sql.defaultColumn.allowedProviders")
.internal()
.doc("List of table providers wherein SQL commands are permitted to
assign DEFAULT column " +
- "values. Comma-separated list, whitespace ignored, case-insensitive.")
+ "values. Comma-separated list, whitespace ignored, case-insensitive.
If an asterisk " +
+ "appears after any table provider in this list, any command may assign
DEFAULT column " +
+ "except ALTER TABLE ... ADD COLUMN. Otherwise, if no asterisk appears,
all commands are " +
Review Comment:
Also, it would be great if we can have a simple explanation about why "alter
table add column" is special.
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