allisonport-db commented on code in PR #38823: URL: https://github.com/apache/spark/pull/38823#discussion_r1049104281
########## sql/catalyst/src/main/java/org/apache/spark/sql/connector/catalog/TableProvider.java: ########## @@ -93,4 +93,18 @@ default Transform[] inferPartitioning(CaseInsensitiveStringMap options) { default boolean supportsExternalMetadata() { return false; } + + /** + * Returns true if the source supports defining generated columns upon table creation in SQL. + * When false: any create/replace table statements with a generated column defined in the table + * schema will throw an exception during analysis. + * + * A generated column is defined with syntax: {@code colName colType GENERATED ALWAYS AS (expr)} + * The generation expression is stored in the column metadata with key "generationExpression". + * + * Override this method to allow defining generated columns in create/replace table statements. + */ + default boolean supportsGeneratedColumnsOnCreation() { Review Comment: @sunchao `TableCapability` has the same issue described above as including it in `Table` @RussellSpitzer I think it would be up to the implementing data source to restrict what's supported? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org