HeartSaVioR commented on issue #26173: [SPARK-29503][SQL] Copy result row from 
RowWriter in GenerateUnsafeProjection when the expression is lambdaFunction in 
MapObject
URL: https://github.com/apache/spark/pull/26173#issuecomment-544715361
 
 
   Looks like escaping JSON doesn't seem to work consistently during compiling 
generated code.
   
   `val typeToJson = 
StringEscapeUtils.escapeJava(StringEscapeUtils.escapeJson(dataType.json))`
   
   > DataFrameComplexTypeSuite.SPARK-29503 nest unsafe struct inside safe array
   
   ```
   
arrayData_0.copyUnsafeData("{\\\"type\\\":\\\"array\\\",\\\"elementType\\\":{\\\"type\\\":\\\"struct\\\",\\\"fields\\\":[{\\\"name\\\":\\\"col1\\\",\\\"type\\\":\\\"integer\\\",\\\"nullable\\\":true,\\\"metadata\\\":{}}]},\\\"containsNull\\\":false}")
   ```
   
   ```
   /* 140 */         if (false) {
   /* 141 */           convertedArray_0[loopIndex_0] = null;
   /* 142 */         } else {
   /* 143 */           convertedArray_0[loopIndex_0] = 
arrayData_0.copyUnsafeData("{\"type\":\"array\",\"elementType\":{\"type\":\"struct\",\"fields\":[{\"name\":\"col1\",\"type\":\"integer\",\"nullable\":true,\"metadata\":{}}]},\"containsNull\":false}");
   /* 144 */         }
   ```
   
   > ALSSuite.recommendForAllUsers with k <, = and > num_items
   
   ```
   
serializefromobject_value_2.copyUnsafeData("{\\\"type\\\":\\\"struct\\\",\\\"fields\\\":[{\\\"name\\\":\\\"_1\\\",\\\"type\\\":\\\"integer\\\",\\\"nullable\\\":false,\\\"metadata\\\":{}},{\\\"name\\\":\\\"_2\\\",\\\"type\\\":{\\\"type\\\":\\\"array\\\",\\\"elementType\\\":\\\"float\\\",\\\"containsNull\\\":false},\\\"nullable\\\":true,\\\"metadata\\\":{}}]}")
   ```
   
   ```
   /* 112 */         if (serializefromobject_isNull_2) {
   /* 113 */           
serializefromobject_convertedArray_0[serializefromobject_loopIndex_0] = null;
   /* 114 */         } else {
   /* 115 */           
serializefromobject_convertedArray_0[serializefromobject_loopIndex_0] = 
serializefromobject_value_2.copyUnsafeData("{"type":"struct","fields":[{"name":"_1","type":"integer","nullable":false,"metadata":{}},{"name":"_2","type":{"type":"array","elementType":"float","containsNull":false},"nullable":true,"metadata":{}}]}");
   /* 116 */         }
   ```
   
   ----
   `val typeToJson = StringEscapeUtils.escapeJson(dataType.json)`
   
   > DataFrameComplexTypeSuite.SPARK-29503 nest unsafe struct inside safe array
   
   ```
   
arrayData_0.copyUnsafeData("{\"type\":\"array\",\"elementType\":{\"type\":\"struct\",\"fields\":[{\"name\":\"col1\",\"type\":\"integer\",\"nullable\":true,\"metadata\":{}}]},\"containsNull\":false}")
   ```
   
   ```
   /* 140 */         if (false) {
   /* 141 */           convertedArray_0[loopIndex_0] = null;
   /* 142 */         } else {
   /* 143 */           convertedArray_0[loopIndex_0] = 
arrayData_0.copyUnsafeData("{"type":"array","elementType":{"type":"struct","fields":[{"name":"col1","type":"integer","nullable":true,"metadata":{}}]},"containsNull":false}");
   /* 144 */         }
   ```
   
   > ALSSuite.recommendForAllUsers with k <, = and > num_items
   
   ```
   
serializefromobject_value_2.copyUnsafeData("{\"type\":\"struct\",\"fields\":[{\"name\":\"_1\",\"type\":\"integer\",\"nullable\":false,\"metadata\":{}},{\"name\":\"_2\",\"type\":{\"type\":\"array\",\"elementType\":\"float\",\"containsNull\":false},\"nullable\":true,\"metadata\":{}}]}")
   ```
   
   ```
   /* 112 */         if (serializefromobject_isNull_2) {
   /* 113 */           
serializefromobject_convertedArray_0[serializefromobject_loopIndex_0] = null;
   /* 114 */         } else {
   /* 115 */           
serializefromobject_convertedArray_0[serializefromobject_loopIndex_0] = 
serializefromobject_value_2.copyUnsafeData("{"type":"struct","fields":[{"name":"_1","type":"integer","nullable":false,"metadata":{}},{"name":"_2","type":{"type":"array","elementType":"float","containsNull":false},"nullable":true,"metadata":{}}]}");
   /* 116 */         }
   ```
   
   ----
   `val typeToJson = StringEscapeUtils.escapeJava(dataType.json)`
   
   > DataFrameComplexTypeSuite.SPARK-29503 nest unsafe struct inside safe array
   
   ```
   
arrayData_0.copyUnsafeData("{\"type\":\"array\",\"elementType\":{\"type\":\"struct\",\"fields\":[{\"name\":\"col1\",\"type\":\"integer\",\"nullable\":true,\"metadata\":{}}]},\"containsNull\":false}")
   ```
   
   ```
   /* 140 */         if (false) {
   /* 141 */           convertedArray_0[loopIndex_0] = null;
   /* 142 */         } else {
   /* 143 */           convertedArray_0[loopIndex_0] = 
arrayData_0.copyUnsafeData("{"type":"array","elementType":{"type":"struct","fields":[{"name":"col1","type":"integer","nullable":true,"metadata":{}}]},"containsNull":false}");
   /* 144 */         }
   ```
   
   > ALSSuite.recommendForAllUsers with k <, = and > num_items
   
   ```
   
serializefromobject_value_2.copyUnsafeData("{\"type\":\"struct\",\"fields\":[{\"name\":\"_1\",\"type\":\"integer\",\"nullable\":false,\"metadata\":{}},{\"name\":\"_2\",\"type\":{\"type\":\"array\",\"elementType\":\"float\",\"containsNull\":false},\"nullable\":true,\"metadata\":{}}]}")
   ```
   
   ```
   /* 112 */         if (serializefromobject_isNull_2) {
   /* 113 */           
serializefromobject_convertedArray_0[serializefromobject_loopIndex_0] = null;
   /* 114 */         } else {
   /* 115 */           
serializefromobject_convertedArray_0[serializefromobject_loopIndex_0] = 
serializefromobject_value_2.copyUnsafeData("{"type":"struct","fields":[{"name":"_1","type":"integer","nullable":false,"metadata":{}},{"name":"_2","type":{"type":"array","elementType":"float","containsNull":false},"nullable":true,"metadata":{}}]}");
   /* 116 */         }
   ```
   
   So double escaping seems to be only working solution for new UT, but 
consistently fails on ALSSuite - `\\` escape is gone. Not sure why.

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