[C++知识库]Arrow 之 Array Concatenate

Concatenate ListArray

TEST(TestConcatenate, ListType) {
  auto nestype = list(arrow::int8());
  auto array1 = ArrayFromJSON(nestype, "[[1, 2], [3, 4]]");
  auto array2 = ArrayFromJSON(nestype, "[[5, 6, 7], null]");
  auto array3 = ArrayFromJSON(nestype, "[[8], [9, 10]]");

  // ARROW_ASSIGN_OR_RAISE(auto bigArr, Concatenate({array1, array2, array3}, default_memory_pool()));
  ASSERT_OK_AND_ASSIGN(auto bigArr, Concatenate({array1, array2, array3}, default_memory_pool()));
  std::cout << "bigArr->ToString()\n:" <<  bigArr->ToString() << std::endl; 
  std::cout << "bigArr->length()\n:" <<  bigArr->length() << std::endl; 

}

./arrow-array-test --gtest_filter=TestConcatenate.ListType

bigArr->ToString()
[
  [
    1,
    2
  ],
  [
    3,
    4
  ],
  [
    5,
    6,
    7
  ],
  null,
  [
    8
  ],
  [
    9,
    10
  ]
]
bigArr->length()
:6

Concatenate MapArray

TEST(TestConcatenate, MapType) {
  auto nestype = map(utf8(), utf8());
  // auto array1 = ArrayFromJSON(nestype, R"([[["name1", "alice1"]]])");
  // auto array2 = ArrayFromJSON(nestype, R"([[["name2", "alice2"]]])");
  // auto array3 = ArrayFromJSON(nestype, R"([[["name3", "alice3"]]])");

  auto array1 = ArrayFromJSON(nestype,  R"([[["name1", "alice1"]], [["name2", "alice2"]]])");
  auto array2 = ArrayFromJSON(nestype,  R"([[["name1", "alice1"]], [["name2", "alice2"]]])");
  auto array3 = ArrayFromJSON(nestype,  R"([[["name1", "alice1"]], [["name2", "alice2"]]])");

  // ARROW_ASSIGN_OR_RAISE(auto bigArr, Concatenate({array1, array2, array3}, default_memory_pool()));
  ASSERT_OK_AND_ASSIGN(auto bigArr, Concatenate({array1, array2, array3}, default_memory_pool()));
  std::cout << "bigArr->ToString()\n:" <<  bigArr->ToString() << std::endl; 
  std::cout << "bigArr->length()\n:" <<  bigArr->length() << std::endl; 

}

./arrow-array-test --gtest_filter=TestConcatenate.MapType

bigArr->ToString()
[
  keys:
  [
    "name1"
  ]
  values:
  [
    "alice1"
  ],
  keys:
  [
    "name2"
  ]
  values:
  [
    "alice2"
  ],
  keys:
  [
    "name1"
  ]
  values:
  [
    "alice1"
  ],
  keys:
  [
    "name2"
  ]
  values:
  [
    "alice2"
  ],
  keys:
  [
    "name1"
  ]
  values:
  [
    "alice1"
  ],
  keys:
  [
    "name2"
  ]
  values:
  [
    "alice2"
  ]
]
bigArr->length()
:6