How to convert arrow::Array to std::vector?
1
I have an Apache arrow array that is created by reading a file.
std::shared_ptr<arrow::Array> array;
PARQUET_THROW_NOT_OK(reader->ReadColumn(0, &array));
Is there a way to convert it to std::vector or any other native array type in C++?
c++ arrays vector apache-arrow
asked Nov 17 '18 at 0:21
motam79motam79
8791923
add a comment |
1
I have an Apache arrow array that is created by reading a file.
std::shared_ptr<arrow::Array> array;
PARQUET_THROW_NOT_OK(reader->ReadColumn(0, &array));
Is there a way to convert it to std::vector or any other native array type in C++?
c++ arrays vector apache-arrow
asked Nov 17 '18 at 0:21
motam79motam79
8791923
1
The Apache arrow::Array is, according to the documentation a pointer to bitmap data. It's entirely possible to store that in a vector<unsigned char> but you likely will have some casting to do. The arrow::Array class has a data() function that returns a shared pointer to ArrayData and you can call get() and get the data it points to, and range construct your vector with the pointer and the length function of the arrow::Array but your likely going to have to do a cast to make it all work. This is just my thoughts on it, I do not have the apachie arrow library handy to validate any of this.
– johnathan
Nov 17 '18 at 0:33
I think you are right, I need to get the raw pointer and cast it to the intended type and form a vector.
– motam79
Nov 17 '18 at 1:06
add a comment |
1
1
1
I have an Apache arrow array that is created by reading a file.
std::shared_ptr<arrow::Array> array;
PARQUET_THROW_NOT_OK(reader->ReadColumn(0, &array));
Is there a way to convert it to std::vector or any other native array type in C++?
c++ arrays vector apache-arrow
asked Nov 17 '18 at 0:21
motam79motam79
8791923
I have an Apache arrow array that is created by reading a file.
std::shared_ptr<arrow::Array> array;
PARQUET_THROW_NOT_OK(reader->ReadColumn(0, &array));
Is there a way to convert it to std::vector or any other native array type in C++?
c++ arrays vector apache-arrow
c++ arrays vector apache-arrow
asked Nov 17 '18 at 0:21
motam79motam79
8791923
asked Nov 17 '18 at 0:21
motam79motam79
8791923
asked Nov 17 '18 at 0:21
motam79motam79
8791923
asked Nov 17 '18 at 0:21
motam79motam79
8791923
asked Nov 17 '18 at 0:21
motam79motam79
8791923
8791923
1
The Apache arrow::Array is, according to the documentation a pointer to bitmap data. It's entirely possible to store that in a vector<unsigned char> but you likely will have some casting to do. The arrow::Array class has a data() function that returns a shared pointer to ArrayData and you can call get() and get the data it points to, and range construct your vector with the pointer and the length function of the arrow::Array but your likely going to have to do a cast to make it all work. This is just my thoughts on it, I do not have the apachie arrow library handy to validate any of this.
– johnathan
Nov 17 '18 at 0:33
I think you are right, I need to get the raw pointer and cast it to the intended type and form a vector.
– motam79
Nov 17 '18 at 1:06
add a comment |
1
The Apache arrow::Array is, according to the documentation a pointer to bitmap data. It's entirely possible to store that in a vector<unsigned char> but you likely will have some casting to do. The arrow::Array class has a data() function that returns a shared pointer to ArrayData and you can call get() and get the data it points to, and range construct your vector with the pointer and the length function of the arrow::Array but your likely going to have to do a cast to make it all work. This is just my thoughts on it, I do not have the apachie arrow library handy to validate any of this.
– johnathan
Nov 17 '18 at 0:33
I think you are right, I need to get the raw pointer and cast it to the intended type and form a vector.
– motam79
Nov 17 '18 at 1:06
1
1
The Apache arrow::Array is, according to the documentation a pointer to bitmap data. It's entirely possible to store that in a vector<unsigned char> but you likely will have some casting to do. The arrow::Array class has a data() function that returns a shared pointer to ArrayData and you can call get() and get the data it points to, and range construct your vector with the pointer and the length function of the arrow::Array but your likely going to have to do a cast to make it all work. This is just my thoughts on it, I do not have the apachie arrow library handy to validate any of this.
– johnathan
Nov 17 '18 at 0:33
The Apache arrow::Array is, according to the documentation a pointer to bitmap data. It's entirely possible to store that in a vector<unsigned char> but you likely will have some casting to do. The arrow::Array class has a data() function that returns a shared pointer to ArrayData and you can call get() and get the data it points to, and range construct your vector with the pointer and the length function of the arrow::Array but your likely going to have to do a cast to make it all work. This is just my thoughts on it, I do not have the apachie arrow library handy to validate any of this.
– johnathan
Nov 17 '18 at 0:33
I think you are right, I need to get the raw pointer and cast it to the intended type and form a vector.
– motam79
Nov 17 '18 at 1:06
I think you are right, I need to get the raw pointer and cast it to the intended type and form a vector.
– motam79
Nov 17 '18 at 1:06
add a comment |
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1
The Apache arrow::Array is, according to the documentation a pointer to bitmap data. It's entirely possible to store that in a vector<unsigned char> but you likely will have some casting to do. The arrow::Array class has a data() function that returns a shared pointer to ArrayData and you can call get() and get the data it points to, and range construct your vector with the pointer and the length function of the arrow::Array but your likely going to have to do a cast to make it all work. This is just my thoughts on it, I do not have the apachie arrow library handy to validate any of this.
– johnathan
Nov 17 '18 at 0:33
I think you are right, I need to get the raw pointer and cast it to the intended type and form a vector.
– motam79
Nov 17 '18 at 1:06