* feat: Impl cmp_element() for Vector
* chore: Add doc comments to MutableVector
* feat: Add create_mutable() to DataType
Add `create_mutable()` to create a MutableVector for each DataType.
Implement ListVectorBuilder and NullVectorBuilder for ListType and
NullType.
* feat: Add ValueRef
ValueRef is a reference to value, could be used to avoid some allocation
when getting data from Vector. To support ValueRef, also implement a
ListValueRef for ListValue, but comparision of ListValueRef still
requires some allocation, due to the complexity of ListValue and
ListVector.
Impl some From trait for ValueRef
* feat: Implement get_ref for Vector
* feat: Remove cmp_element from Vector
`cmp_element` could be replaced by `get_ref` and then compare
* feat: Implement push/extend for PrimitiveVectorBuilder
Implement push_value_ref() and extend_slice_of() for
PrimitiveVectorBuilder.
Also refactor the DataTypeBuilder trait for
primitive types to PrimitiveElement trait, adds necessary cast helper
methods to it.
- Cast a reference to Vector to reference arrow's primitive array
- Cast a ValueRef to primitive type
- Also make PrimitiveElement super trait of Primitive
* feat: Implement push/extend for all vector builders
Implement push_value_ref() and extend_slice_of() for remaining vector
builders. Add some helpful cast method to ValueRef and a method to
cast Value to ValueRef.
Change the behavior of PrimitiveElement::cast_xxx to panic when unable
to cast, since push_value_ref() and extend_slice_of() always panic
when given invalid input data type.
* feat: MutableVector returns error if data type unmatch
* test: Add tests for ValueRef
* feat: Add tests for Vector::get_ref
* feat: NullVector returns error if data type unmatch
* test: Add tests for vector builders
* fix: Fix compile error in python coprocessor
* refactor: Add lifetime param to IntoValueRef
The Primitive trait just use the `IntoValueRef<'static>` bound. Also
rename create_mutable to create_mutable_vector.
* chore: Address CR comments
* feat: Customize PartialOrd/Ord for Value/ValueRef
Panics if values/refs have different data type
* style: Fix clippy
* refactor: Use macro to generate body of ValueRef::as_xxx
