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https://issues.apache.org/jira/browse/CALCITE-5451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17651382#comment-17651382
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Oliver Lee commented on CALCITE-5451:
-------------------------------------
Hey Julian,
I've been having the habit of filling out the ticket description in detail
after I'm done the PR, but moving forwards I'll fill it out as I create it!
Got it, I'll add RPAD to this too.
> Add LPAD() for BIG_QUERY
> ------------------------
>
> Key: CALCITE-5451
> URL: https://issues.apache.org/jira/browse/CALCITE-5451
> Project: Calcite
> Issue Type: Improvement
> Reporter: Oliver Lee
> Assignee: Oliver Lee
> Priority: Minor
>
> Adding in LPAD() for BIG_QUERY as per
> [https://g3doc.corp.google.com/company/teams/googlesql/reference/string_functions.md?cl=head#lpad]
> describes
>
> {{LPAD(original_value, return_length[, pattern])}}
> {quote}Returns a {{STRING}} or {{BYTES}} value that consists of
> {{original_value}} prepended with {{{}pattern{}}}. The {{return_length}} is
> an {{INT64}} that specifies the length of the returned value. If
> {{original_value}} is of type {{{}BYTES{}}}, {{return_length}} is the number
> of bytes. If {{original_value}} is of type {{{}STRING{}}}, {{return_length}}
> is the number of characters.
> The default value of {{pattern}} is a blank space.
> Both {{original_value}} and {{pattern}} must be the same data type.
> If {{return_length}} is less than or equal to the {{original_value}} length,
> this function returns the {{original_value}} value, truncated to the value of
> {{{}return_length{}}}. For example, {{LPAD('hello world', 7);}} returns
> {{{}'hello w'{}}}.
> If {{{}original_value{}}}, {{{}return_length{}}}, or {{pattern}} is
> {{{}NULL{}}}, this function returns {{{}NULL{}}}.
> This function returns an error if:
> * {{return_length}} is negative
> * {{pattern}} is empty{quote}
>
> Examples:
> LPAD('12345', 8, 'a') -> "aaa12345"
> LPAD('12345', 8) -> " 12345"
> LPAD('12345', 8, 'ab') -> "aba12345"
> LPAD('12345', 8, 'a') -> "aaa12345"
> LPAD('12345', -3) -> error
> LPAD('12345', 3, '') -> error
>
>
>
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