[CARMEL-6484] Infer IsNotNull constraints for GetJsonObject (#1196)

Author: wakun

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala

@@ -1009,6 +1009,7 @@ object InferFiltersFromConstraints extends Rule[LogicalPlan]
     case e if !e.nullable || e.find(_.isInstanceOf[PythonUDF]).nonEmpty => false
     case Cast(child, dataType, _, _) => !Cast.canUpCast(child.dataType, dataType)
     case c: Coalesce => true
+    case _: GetJsonObject => true
     case _ => false
   }