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[C++][Gandiva] Implement LPAD and RPAD functions for string input values #28326

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Implement LPAD and RPAD functions for string input values.

  • LPAD([string] basetext, [number] x, [optional string] padtext)

  • RPAD([string] basetext, [number] x, [optional string] padtext)

    lpad - Prepends padtext to basetext in a way that allows as many characters as possible from padtext given an output string length of x. When x is less than or equal to the length of basetext, only characters from basetext are printed in the output. If padtext is omitted then spaces are prepended.

    rpad - Appends padtext to basetext in a way that allows as many characters as possible from padtext given an output string length of x. When x is less than or equal to the length of basetext, only characters from basetext are printed in the output. If padtext is omitted then spaces are appended.

Reporter: João Pedro Antunes Ferreira / @jpedroantunes
Assignee: João Pedro Antunes Ferreira / @jpedroantunes

PRs and other links:

Note: This issue was originally created as ARROW-12567. Please see the migration documentation for further details.

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