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Cast between array elements #6558
Description
Is your feature request related to a problem or challenge?
Arter Pull Request: #6384, In arrow-datafusion casting between arrays elements stopped working. The feature could be of great help when working with different types of data.
Describe the solution you'd like
All rules should be simillar to the cast function in arrow-rs (See https://docs.rs/arrow/latest/arrow/compute/kernels/cast/index.html)
For example, if we create new array with Int32Type and Int64Type should return Int64Array.
select make_array(Int32(1), Int64(2));
----
Int64(1), Int64(2)
Describe alternatives you've considered
No response
Additional context
Simillar PR:
#6384
Reacted by Andrew Lamb
Activity
jayzhan211 commentedon Jun 8, 2023
How to determine the final data type? For example, make_array(int, uint, float), what should be the result data type?
izveigor commentedon Jun 8, 2023
@jayzhan211
arrow-datafusionhas rules for data type coercion (See https://github.com/apache/arrow-datafusion/blob/main/datafusion/expr/src/type_coercion/binary.rs)For your instance, the result should be
floatdata type (becauseInt->UIntandUInt->Float)jayzhan211 commentedon Jun 9, 2023
I will take this