[GLUTEN-5341][VL] Fix SPARK-42782: Hive compatibility check for get_j…

…son_object (apache#5467)

docs/velox-backend-limitations.md

@@ -47,6 +47,8 @@ In certain cases, Gluten result may be different from Vanilla spark.
 #### JSON functions
 Velox only supports double quotes surrounded strings, not single quotes, in JSON data. If single quotes are used, gluten will produce incorrect result.
 
+Velox doesn't support [*] in path when get_json_object function is called and returns null instead.
+
 #### Parquet read conf
 Gluten supports `spark.files.ignoreCorruptFiles` with default false, if true, the behavior is same as config false.
 Gluten ignores `spark.sql.parquet.datetimeRebaseModeInRead`, it only returns what write in parquet file. It does not consider the difference between legacy

gluten-ut/spark35/src/test/scala/org/apache/gluten/utils/velox/VeloxTestSettings.scala

@@ -126,7 +126,7 @@ class VeloxTestSettings extends BackendTestSettings {
   enableSuite[GlutenHigherOrderFunctionsSuite]
   enableSuite[GlutenIntervalExpressionsSuite]
   enableSuite[GlutenJsonFunctionsSuite]
-    // Disable for Spark3.5.
+    // * in get_json_object expression not supported in velox
     .exclude("SPARK-42782: Hive compatibility check for get_json_object")
     // Velox does not support single quotes in get_json_object function.
     .exclude("function get_json_object - support single quotes")

gluten-ut/spark35/src/test/scala/org/apache/spark/sql/GlutenJsonFunctionsSuite.scala

@@ -16,4 +16,89 @@
  */
 package org.apache.spark.sql
 
-class GlutenJsonFunctionsSuite extends JsonFunctionsSuite with GlutenSQLTestsTrait {}
+class GlutenJsonFunctionsSuite extends JsonFunctionsSuite with GlutenSQLTestsTrait {
+  import testImplicits._
+
+  testGluten("SPARK-42782: Hive compatibility check for get_json_object ") {
+    val book0 = "{\"author\":\"Nigel Rees\",\"title\":\"Sayings of the Century\"" +
+      ",\"category\":\"reference\",\"price\":8.95}"
+    val backet0 = "[1,2,{\"b\":\"y\",\"a\":\"x\"}]"
+    val backet = "[" + backet0 + ",[3,4],[5,6]]"
+    val backetFlat = backet0.substring(0, backet0.length() - 1) + ",3,4,5,6]"
+
+    val book = "[" + book0 + ",{\"author\":\"Herman Melville\",\"title\":\"Moby Dick\"," +
+      "\"category\":\"fiction\",\"price\":8.99" +
+      ",\"isbn\":\"0-553-21311-3\"},{\"author\":\"J. R. R. Tolkien\"" +
+      ",\"title\":\"The Lord of the Rings\",\"category\":\"fiction\"" +
+      ",\"reader\":[{\"age\":25,\"name\":\"bob\"},{\"age\":26,\"name\":\"jack\"}]" +
+      ",\"price\":22.99,\"isbn\":\"0-395-19395-8\"}]"
+
+    val json = "{\"store\":{\"fruit\":[{\"weight\":8,\"type\":\"apple\"}," +
+      "{\"weight\":9,\"type\":\"pear\"}],\"basket\":" + backet + ",\"book\":" + book +
+      ",\"bicycle\":{\"price\":19.95,\"color\":\"red\"}}" +
+      ",\"email\":\"amy@only_for_json_udf_test.net\"" +
+      ",\"owner\":\"amy\",\"zip code\":\"94025\",\"fb:testid\":\"1234\"}"
+
+    // Basic test
+    runTest(json, "$.owner", "amy")
+    runTest(json, "$.store.bicycle", "{\"price\":19.95,\"color\":\"red\"}")
+    runTest(json, "$.store.book", book)
+    runTest(json, "$.store.book[0]", book0)
+    // runTest(json, "$.store.book[*]", book) - not supported in velox
+    runTest(json, "$.store.book[0].category", "reference")
+    // runTest(json, "$.store.book[*].category",
+    // "[\"reference\",\"fiction\",\"fiction\"]") - not supported in velox
+    // runTest(json, "$.store.book[*].reader[0].age", "25") - not supported in velox
+    // runTest(json, "$.store.book[*].reader[*].age", "[25,26]") - not supported in velox
+    runTest(json, "$.store.basket[0][1]", "2")
+    // runTest(json, "$.store.basket[*]", backet) - not supported in velox
+    // runTest(json, "$.store.basket[*][0]", "[1,3,5]") - not supported in velox
+    // runTest(json, "$.store.basket[0][*]", backet0) - not supported in velox
+    // runTest(json, "$.store.basket[*][*]", backetFlat) - not supported in velox
+    runTest(json, "$.store.basket[0][2].b", "y")
+    // runTest(json, "$.store.basket[0][*].b", "[\"y\"]") - not supported in velox
+    runTest(json, "$.non_exist_key", null)
+    runTest(json, "$.store.book[10]", null)
+    runTest(json, "$.store.book[0].non_exist_key", null)
+    // runTest(json, "$.store.basket[*].non_exist_key", null) - not supported in velox
+    // runTest(json, "$.store.basket[0][*].non_exist_key", null) - not supported in velox
+    // runTest(json, "$.store.basket[*][*].non_exist_key", null) - not supported in velox
+    runTest(json, "$.zip code", "94025")
+    runTest(json, "$.fb:testid", "1234")
+    // runTest("{\"a\":\"b\nc\"}", "$.a", "b\nc") - not supported in velox
+
+    // Test root array
+    runTest("[1,2,3]", "$[0]", "1")
+    runTest("[1,2,3]", "$.[0]", null) // Not supported in spark and velox
+    runTest("[1,2,3]", "$.[1]", null) // Not supported in spark and velox
+    runTest("[1,2,3]", "$[1]", "2")
+
+    runTest("[1,2,3]", "$[3]", null)
+    runTest("[1,2,3]", "$.[*]", null) // Not supported in spark and velox
+    // runTest("[1,2,3]", "$[*]", "[1,2,3]") - not supported in velox
+    // runTest("[1,2,3]", "$", "[1,2,3]") - not supported in velox
+    runTest("[{\"k1\":\"v1\"},{\"k2\":\"v2\"},{\"k3\":\"v3\"}]", "$[2]", "{\"k3\":\"v3\"}")
+    runTest("[{\"k1\":\"v1\"},{\"k2\":\"v2\"},{\"k3\":\"v3\"}]", "$[2].k3", "v3")
+    runTest("[{\"k1\":[{\"k11\":[1,2,3]}]}]", "$[0].k1[0].k11[1]", "2")
+    runTest("[{\"k1\":[{\"k11\":[1,2,3]}]}]", "$[0].k1[0].k11", "[1,2,3]")
+    runTest("[{\"k1\":[{\"k11\":[1,2,3]}]}]", "$[0].k1[0]", "{\"k11\":[1,2,3]}")
+    runTest("[{\"k1\":[{\"k11\":[1,2,3]}]}]", "$[0].k1", "[{\"k11\":[1,2,3]}]")
+    runTest("[{\"k1\":[{\"k11\":[1,2,3]}]}]", "$[0]", "{\"k1\":[{\"k11\":[1,2,3]}]}")
+    runTest("[[1,2,3],[4,5,6],[7,8,9]]", "$[1]", "[4,5,6]")
+    runTest("[[1,2,3],[4,5,6],[7,8,9]]", "$[1][0]", "4")
+    runTest("[\"a\",\"b\"]", "$[1]", "b")
+    runTest("[[\"a\",\"b\"]]", "$[0][1]", "b")
+
+    runTest("[1,2,3]", "[0]", "1")
+    // runTest("[1,2,3]", "$0", null) crashes in velox
+    runTest("[1,2,3]", "0", null)
+    runTest("[1,2,3]", "$.", null)
+
+    // runTest("[1,2,3]", "$", "[1,2,3]") crashes in velox
+    // runTest("{\"a\":4}", "$", "{\"a\":4}") crashes in velox
+
+    def runTest(json: String, path: String, exp: String): Unit = {
+      checkAnswer(Seq(json).toDF().selectExpr(s"get_json_object(value, '$path')"), Row(exp))
+    }
+  }
+}