document substr(bytea)

[neverchanje]

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• Description

  • [ What's changed? Which parts of the docs are affected? ]

• Notes

  • [ Include any supplementary context or references here. ]

• Related code PR

  feat(expr): substring/substr for bytea risingwave#13088

• Related doc issue

  Resolves Document: feat(expr): substring/substr for bytea #1423

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[xiangjinwu]

We have another page for bytea functions:
https://github.com/risingwavelabs/risingwave-docs/blob/main/docs/sql/functions-operators/sql-function-binarystring.md

Note that some functions are similar between varchar (aka text) and bytea, while some are different.
risingwavelabs/risingwave#8831

[neverchanje]

Thanks for reminding! Please take a look now @xiangjinwu !

[xiangjinwu]

lgtm