[GitHub] [spark] dongjoon-hyun commented on a change in pull request #30047: [SPARK-33078][SQL] Add config for json expression optimization

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dongjoon-hyun commented on a change in pull request #30047:
URL: https://github.com/apache/spark/pull/30047#discussion_r505162258



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File path: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -1458,6 +1458,15 @@ object SQLConf {
       .booleanConf
       .createWithDefault(true)
 
+  val JSON_EXPRESSION_OPTIMIZATION =
+    buildConf("spark.sql.optimizer.jsonExpressionOptimization")
+      .doc("Whether to optimize Json expressions in SQL optimizer. It includes pruning " +
+        "unnecessary columns from from_json, simplifing from_json + to_json, to_json + " +
+        "named_struct(from_json.col1, from_json.col2, ....).")
+      .version("3.1.0")
+      .booleanConf
+      .createWithDefault(true)

Review comment:
       Thank you for adding this, @viirya .




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