zhipengmao-db commented on code in PR #47614:
URL: https://github.com/apache/spark/pull/47614#discussion_r1758982153


##########
sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/Column.java:
##########
@@ -113,6 +125,12 @@ static Column create(
   @Nullable
   String generationExpression();
 
+  /**
+   * Returns the identity column specification of this table column. Null 
means no identity column.
+   */
+  @Nullable
+  IdentityColumnSpec identityColumnSpec();

Review Comment:
   Great catch! 
   Yes only one of the `defaultValue`, `generationExpression` and 
`identityColumnSpec` can be non-null.
   
   We blocked generation expression to be specified with identity column in SQL 
syntax, but we did not block `defaultValue` to be specified with identity 
column. Will provide a fix in this PR.



##########
sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/Column.java:
##########
@@ -113,6 +125,12 @@ static Column create(
   @Nullable
   String generationExpression();
 
+  /**
+   * Returns the identity column specification of this table column. Null 
means no identity column.
+   */
+  @Nullable
+  IdentityColumnSpec identityColumnSpec();

Review Comment:
   Great catch! Yes only one of the `defaultValue`, `generationExpression` and 
`identityColumnSpec` can be non-null.
   We blocked generation expression to be specified with identity column in SQL 
syntax, but we did not block `defaultValue` to be specified with identity 
column. Will provide a fix in this PR.



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