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Function `visibleWidth` returns incorrect result in presence of "Zero Width Joiner" and "Variation Selector" code points. #50458

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alexey-milovidov opened this issue Jun 2, 2023 · 0 comments

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alexey-milovidov commented Jun 2, 2023

Use case

SELECT
    '🤦🏼‍♂️' AS str,
    length(str),
    lengthUTF8(str),
    visibleWidth(str)

Query id: e3fa54e8-fb28-4ebb-9bd7-16be7b65b7cd

┌─str──┬─length(str)─┬─lengthUTF8(str)─┬─visibleWidth(str)─┐
│ 🤦🏼‍♂️ │          17 │               5 │                 5 │
└──────┴─────────────┴─────────────────┴───────────────────┘

Describe the solution you'd like

Both code points should "collapse" two previous ones into one.

Additional context

https://hsivonen.fi/string-length/

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alexey-milovidov added the enhancement label

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