westonpace commented on code in PR #14292:
URL: https://github.com/apache/arrow/pull/14292#discussion_r1045247283


##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -2331,8 +2332,8 @@ TEST(Substrait, ProjectRel) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},
+                       conversion_options);

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
                          conversion_options);
   ```
   
   Minor nit



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -2773,8 +2774,8 @@ TEST(Substrait, JoinRelEndToEnd) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -2624,8 +2625,8 @@ TEST(Substrait, FilterRelWithEmit) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3032,8 +3033,8 @@ TEST(Substrait, AggregateRel) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -2449,8 +2450,8 @@ TEST(Substrait, ProjectRelOnFunctionWithEmit) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},
+                       conversion_options);

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
                          conversion_options);
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3504,8 +3505,8 @@ TEST(Substrait, NestedProjectWithMultiFieldExpressions) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3687,10 +3688,120 @@ TEST(Substrait, ReadRelWithGlobFiles) {
       }
     }]
   })"));
-
+  // To avoid unnecessar meta data columns being included in the final result
+  std::vector<int> include_columns = {0, 1, 2};
   compute::SortOptions options({compute::SortKey("A", 
compute::SortOrder::Ascending)});
-  CheckRoundTripResult(std::move(dummy_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, {}, &options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf,
+                       std::move(include_columns), {}, &options);

Review Comment:
   ```suggestion
                          std::move(include_columns), 
/*conversion_options=*/{}, &options);
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3687,10 +3688,120 @@ TEST(Substrait, ReadRelWithGlobFiles) {
       }
     }]
   })"));
-
+  // To avoid unnecessar meta data columns being included in the final result

Review Comment:
   ```suggestion
     // To avoid unnecessary metadata columns being included in the final result
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3687,10 +3688,120 @@ TEST(Substrait, ReadRelWithGlobFiles) {
       }
     }]
   })"));
-
+  // To avoid unnecessar meta data columns being included in the final result
+  std::vector<int> include_columns = {0, 1, 2};
   compute::SortOptions options({compute::SortKey("A", 
compute::SortOrder::Ascending)});
-  CheckRoundTripResult(std::move(dummy_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, {}, &options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf,
+                       std::move(include_columns), {}, &options);
+}
+
+TEST(Substrait, RootRelationOutputNames) {
+  compute::ExecContext exec_context;
+  auto dummy_schema =
+      schema({field("A", int32()), field("B", int32()), field("C", int32())});
+
+  // creating a dummy dataset using a dummy table
+  const std::vector<std::string> str_data_vec = {
+      R"([
+      [10, 1, 80],
+      [20, 2, 70],
+      [30, 3, 30]
+  ])"};
+  auto input_table = TableFromJSON(dummy_schema, str_data_vec);
+
+  const std::string substrait_json = R"({
+    "relations": [{
+      "root": {
+        "input": {
+          "project": {
+            "common": {
+              "emit": {
+                "outputMapping": [3, 4, 5]
+              }
+            },
+            "input": {
+              "read": {
+                "common": {
+                  "direct": {
+                  }
+                },
+                "baseSchema": {
+                  "names": ["A", "B", "C"],
+                  "struct": {
+                    "types": [{
+                      "i32": {
+                        "typeVariationReference": 0,
+                        "nullability": "NULLABILITY_REQUIRED"
+                      }
+                    }, {
+                      "i32": {
+                        "typeVariationReference": 0,
+                        "nullability": "NULLABILITY_REQUIRED"
+                      }
+                    }, {
+                      "i32": {
+                        "typeVariationReference": 0,
+                        "nullability": "NULLABILITY_REQUIRED"
+                      }
+                    }],
+                    "typeVariationReference": 0,
+                    "nullability": "NULLABILITY_REQUIRED"
+                  }
+                },
+                "namedTable": {
+                  "names": ["SIMPLEDATA"]
+                }
+              }
+            },
+            "expressions": [{
+              "selection": {
+                "directReference": {
+                  "structField": {
+                    "field": 0
+                  }
+                },
+                "rootReference": {
+                }
+              }
+            }, {
+              "selection": {
+                "directReference": {
+                  "structField": {
+                    "field": 1
+                  }
+                },
+                "rootReference": {
+                }
+              }
+            }, {
+              "selection": {
+                "directReference": {
+                  "structField": {
+                    "field": 2
+                  }
+                },
+                "rootReference": {
+                }
+              }
+            }]
+          }
+        },
+        "names": ["X", "Y", "Z"]
+      }
+    }]
+  })";
+
+  ASSERT_OK_AND_ASSIGN(auto buf, internal::SubstraitFromJSON("Plan", 
substrait_json));
+  auto output_schema =
+      schema({field("X", int32()), field("Y", int32()), field("Z", int32())});
+  auto expected_table = TableFromJSON(output_schema, str_data_vec);
+
+  NamedTableProvider table_provider = 
AlwaysProvideSameTable(std::move(input_table));
+
+  ConversionOptions conversion_options;
+  conversion_options.named_table_provider = std::move(table_provider);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3146,8 +3147,8 @@ TEST(Substrait, AggregateRelEmit) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -2924,8 +2925,8 @@ TEST(Substrait, JoinRelWithEmit) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -2507,8 +2508,8 @@ TEST(Substrait, ReadRelWithEmit) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3416,8 +3417,8 @@ TEST(Substrait, ProjectWithMultiFieldExpressions) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3593,8 +3594,8 @@ TEST(Substrait, 
NestedEmitProjectWithMultiFieldExpressions) {
   ConversionOptions conversion_options;
   conversion_options.named_table_provider = std::move(table_provider);
 
-  CheckRoundTripResult(std::move(output_schema), std::move(expected_table), 
exec_context,
-                       buf, {}, conversion_options);
+  CheckRoundTripResult(std::move(expected_table), exec_context, buf, {},

Review Comment:
   ```suggestion
     CheckRoundTripResult(std::move(expected_table), exec_context, buf, 
/*include_columns=*/{},
   ```



##########
cpp/src/arrow/engine/substrait/serde_test.cc:
##########
@@ -3257,8 +3258,8 @@ TEST(Substrait, IsthmusPlan) {
                                                    
/*ignore_unknown_fields=*/false));
 
   auto expected_table = TableFromJSON(test_schema, {"[[2], [3], [6]]"});
-  CheckRoundTripResult(std::move(test_schema), std::move(expected_table),
-                       *compute::default_exec_context(), buf, {}, 
conversion_options);
+  CheckRoundTripResult(std::move(expected_table), 
*compute::default_exec_context(), buf,
+                       {}, conversion_options);

Review Comment:
   ```suggestion
                          /*include_columns=*/{}, conversion_options);
   ```



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