chenhao-db commented on code in PR #43707:
URL: https://github.com/apache/spark/pull/43707#discussion_r1390064666


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala:
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@@ -808,6 +809,9 @@ object FunctionRegistry {
     expression[LengthOfJsonArray]("json_array_length"),
     expression[JsonObjectKeys]("json_object_keys"),
 
+    // Variant
+    expression[ParseJson]("parse_json"),

Review Comment:
   I will have an actual implementation for `parse_json` in the future. At this 
point, I think it is beneficial to include a "fake" implementation to help 
testing and experimenting.



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