pitrou commented on a change in pull request #11607:
URL: https://github.com/apache/arrow/pull/11607#discussion_r742931213



##########
File path: docs/source/format/Columnar.rst
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@@ -622,11 +619,11 @@ use cases:
 * A sparse union is more amenable to vectorized expression evaluation in some 
use cases.
 * Equal-length arrays can be interpreted as a union by only defining the types 
array.
 
-**Example layout: ``SparseUnion<u0: Int32, u1: Float, u2: VarBinary>``**
+**Example layout: ``SparseUnion<i: Int32, f: Float, s: VarBinary>``**

Review comment:
       While we are at it, can we use consistent casing for types (here we use 
Int32 and Float, in the dense union section above it's lowercased, and the 
examples seem a bit of a mixed bag :-))?




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