[jira] [Commented] (CALCITE-3959) Implement BigQuery INSTR function

["Julian Hyde (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-3959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709511#comment-17709511 ] 

Julian Hyde commented on CALCITE-3959:
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What libraries? You mention BigQuery but a quick search shows MySQL and Oracle. 

The cleanest implementation might be to allow POSITION to take 4 arguments internally and desugar INSTR to POSITION. 

> Implement BigQuery INSTR function
> ---------------------------------
>
>                 Key: CALCITE-3959
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3959
>             Project: Calcite
>          Issue Type: Wish
>            Reporter: xzh_dz
>            Assignee: Joey Moore
>            Priority: Major
>
> BiqQuery supports the [INSTR|https://cloud.google.com/bigquery/docs/reference/standard-sql/string_functions#instr](source_value, search_value[, position[, occurrence]]) function which accepts 2 (character strings or binary strings), 1 optional int representing position, and 1 optional int representing occurrence.
> Occurrence and position are assigned a default value of 1 if not specified.
> The function returns the 1-based position of the nth occurrence of the 2nd operand in the 1st operand where n is defined by the 4th operand. The function begins searching at the 1-based position specified in the 3rd operand.
> The function also supports negative position values, with -1 indicating the last character, and will search backwards from the position specified in that case. 
> Returns 0 if:
>  * No match is found.
>  * If occurrence is greater than the number of matches found.
>  * If position is greater than the length of source_value.
> Returns NULL if:
>  * Any input argument is NULL.
> Returns an error if:
>  * position is 0.
>  * occurrence is 0 or negative.
> EXAMPLE: {{INSTR("abc", "bc")}} would return 2.
> EXAMPLE: {{INSTR("abcabc", "bc", 3)}} would return 5.
> EXAMPLE: {{INSTR("abcabc", "bc", -1, 1)}} would return 5.
> EXAMPLE: {{INSTR("abcabc", "bc", -1, 2)}} would return 2.



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