[GitHub] [calcite] libenchao commented on a diff in pull request #2932: [CALCITE-5304] RelJson should support RexSubQuery

[GitBox <gi...@apache.org>]

libenchao commented on code in PR #2932:
URL: https://github.com/apache/calcite/pull/2932#discussion_r1070270379


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core/src/main/java/org/apache/calcite/rel/externalize/RelJson.java:
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@@ -122,10 +127,32 @@ public RelJson withInputTranslator(InputTranslator inputTranslator) {
     return new RelJson(jsonBuilder, inputTranslator);
   }
 
+  /** Returns a RelJson with a given RelJsonReader. */
+  @SuppressWarnings("initialization.invalid.field.write.initialized")
+  public RelJson withRelJsonReader(@UnknownInitialization RelJsonReader relJsonReader) {
+    this.relJsonReader = relJsonReader;
+    return this;
+  }
+
+  /** Returns a RelJson with a given RelJsonWriter. */
+  @SuppressWarnings("initialization.invalid.field.write.initialized")
+  public RelJson withRelJsonWriter(@UnknownInitialization RelJsonWriter relJsonWriter) {
+    this.relJsonWriter = relJsonWriter;
+    return this;
+  }
+
   private JsonBuilder jsonBuilder() {
     return requireNonNull(jsonBuilder, "jsonBuilder");
   }
 
+  private RelJsonWriter relJsonWriter() {
+    return requireNonNull(relJsonWriter, "relJsonWriter");
+  }
+
+  private RelJsonReader relJsonReader() {

Review Comment:
   Because there is a `RelNode` in `RexSubQuery`, to serialize/deserialize a `RelNode`, we need to use `RelJsonWriter` and `RelJsonReader`.



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