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ARROW-15244: [Format] Clarify that offsets are monotonic for binary like arrays #12019

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ARROW-15244: [Format] Clarify that offsets are monotonic for binary like arrays #12019

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8f26a27
(docs) Clarify that offsets are monotonic for binary like arrays
alamb Dec 22, 2021
9133465
Update docs/source/format/Columnar.rst
alamb Dec 22, 2021
7d071f8
Update docs/source/format/Columnar.rst
alamb Dec 23, 2021
ead13c1
Fix reST markup
pitrou Jan 4, 2022
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6 changes: 5 additions & 1 deletion docs/source/format/Columnar.rst
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Expand Up @@ -309,7 +309,11 @@ That is, a null value may occupy a **non-empty** memory space in the data
buffer. When this is true, the content of the corresponding memory space
is undefined.

Generally the first value in the offsets array is 0, and the last slot
Offsets must be monotonic, that is `offsets[j+1] >= offsets[j]` for
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`0 <= j < length`, even for null slots. This property ensures the
**location** for all values is valid and well defined.

Generally the first slot in the offsets array is 0, and the last slot
is the length of the values array. When serializing this layout, we
recommend normalizing the offsets to start at 0.

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