gengliangwang commented on code in PR #37256:
URL: https://github.com/apache/spark/pull/37256#discussion_r929562347
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sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -2919,6 +2919,17 @@ object SQLConf {
.stringConf
.createWithDefault("csv,json,orc,parquet")
+ val ADD_DEFAULT_COLUMN_EXISTING_TABLE_BANNED_PROVIDERS =
+ buildConf("spark.sql.defaultColumn.addColumnExistingTableBannedProviders")
+ .internal()
+ .doc("List of table providers wherein SQL commands are NOT permitted to
assign DEFAULT " +
+ "values to new columns in existing tables, such as when using the
ALTER TABLE ... " +
+ "ADD COLUMNS command in SQL. Comma-separated list, whitespace ignored,
case-insensitive.")
Review Comment:
We do support enum configurations via checking string values. You can check
STORE_ASSIGNMENT_POLICY as an example.
For data sources, we can't make it enum since there are external data
sources, e.g. Delta, BigQuery, etc.
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