chaoyli edited a comment on issue #5142:
URL:
https://github.com/apache/incubator-doris/issues/5142#issuecomment-750837917
The array will support the **array_contains, array_slice, flatten, a[5]**
function.
This function should to eliminate the memory copy in Array.
So the memory layout will store the data in bottom level.
Every function will return a new Array.
```
The memory layout:
Two-level data : [[1, 2], [3, 4]], [[5, 6, 7], null, [8]], [[9, 10]]
* First Level Offsets (int32), First Level have no nulls
| Bytes 0-3 | Bytes 4-7 | Bytes 8-11 | Bytes 12-15 |
|------------|------------|------------|-------------|
| 0 | 2 | 5 | 6 |
* Second Nulls (uint8)
| Byte 1- 3 | Bytes 4 | Bytes 5 - 7|
|-----------------------------------|
| 0 | 1 | 0 |
* Second Level Offsets (int32)
| Bytes 0-27 |
|----------------------|
| 0, 2, 4, 7, 7, 8, 10 |
* Elements array (int32):
| Bytes 0-9 |
|-------------------------------|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 |
```
Like the above, every level in array only stores nulls and offsets.
And also, offsets will store zero to calculate the first size.
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