[GitHub] [flink] godfreyhe commented on a diff in pull request #20118: [FLINK-28334][table-planner] Fix PushProjectIntoTableSourceScanRule: covers the case when table source SupportsReadingMetadata and not SupportsProjectionPushDown

[GitBox]

godfreyhe commented on code in PR #20118:
URL: https://github.com/apache/flink/pull/20118#discussion_r914676211


##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/plan/rules/logical/PushProjectIntoTableSourceScanRule.java:
##########
@@ -337,11 +339,69 @@ private RowType performPushDown(
     private List<RexNode> rewriteProjections(
             RelOptRuleCall call, TableSourceTable source, NestedSchema 
projectedSchema) {
         final LogicalProject project = call.rel(0);
+        List<RexNode> newProjects = project.getProjects();
+
         if (supportsProjectionPushDown(source.tableSource())) {
-            return NestedProjectionUtil.rewrite(
-                    project.getProjects(), projectedSchema, 
call.builder().getRexBuilder());
-        } else {
-            return project.getProjects();
+            // if support project push down, then all input ref will be 
rewritten includes metadata

Review Comment:
   It's better we can create a JIRA to tract this improvement



-- 
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: issues-unsubscr...@flink.apache.org

For queries about this service, please contact Infrastructure at:
us...@infra.apache.org