fn make_map_array_internal<O: OffsetSizeTrait>(
keys: ArrayRef,
values: ArrayRef,
) -> Result<ColumnarValue>Expand description
Helper function to create MapArray from array of values to support arrays for Map scalar function
Format of input KEYS and VALUES column
keys values
+---------------------+ +---------------------+
| +-----------------+ | | +-----------------+ |
| | [k11, k12, k13] | | | | [v11, v12, v13] | |
| +-----------------+ | | +-----------------+ |
| | | |
| +-----------------+ | | +-----------------+ |
| | [k21, k22, k23] | | | | [v21, v22, v23] | |
| +-----------------+ | | +-----------------+ |
| | | |
| +-----------------+ | | +-----------------+ |
| |[k31, k32, k33] | | | |[v31, v32, v33] | |
| +-----------------+ | | +-----------------+ |
+---------------------+ +---------------------+Flattened keys and values array to user create StructArray,
which serves as inner child for MapArray
Flattened Flattened
Keys Values
+-----------+ +-----------+
| +-------+ | | +-------+ |
| | k11 | | | | v11 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k12 | | | | v12 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k13 | | | | v13 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k21 | | | | v21 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k22 | | | | v22 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k23 | | | | v23 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k31 | | | | v31 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k32 | | | | v32 | |
| +-------+ | | +-------+ |
| +-------+ | | +-------+ |
| | k33 | | | | v33 | |
| +-------+ | | +-------+ |
+-----------+ +-----------+
```text