danny0405 commented on a change in pull request #8844: 
[FLINK-12951][table-planner] Add logic to bridge DDL to table source(…
URL: https://github.com/apache/flink/pull/8844#discussion_r300223062
 
 

 ##########
 File path: 
flink-table/flink-table-common/src/main/java/org/apache/flink/table/api/TableSchema.java
 ##########
 @@ -304,6 +304,22 @@ public Builder() {
                        fieldDataTypes = new ArrayList<>();
                }
 
+               /** Create a proto builder from an existing schema.
+                *
+                * <p>Caution: This will invoke {@link #instance()}} to fetch a 
new builder first.
+                */
+               public Builder proto(TableSchema other) {
 
 Review comment:
   Create a builder from another TableSchema.

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