[jira] [Created] (CALCITE-5660) Implement BigQuery Array Subscript Operators

["Tanner Clary (Jira)" <ji...@apache.org>]

Tanner Clary created CALCITE-5660:
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             Summary: Implement BigQuery Array Subscript Operators
                 Key: CALCITE-5660
                 URL: https://issues.apache.org/jira/browse/CALCITE-5660
             Project: Calcite
          Issue Type: Task
            Reporter: Tanner Clary
            Assignee: Tanner Clary


When indexing an array in BigQuery, you are required to wrap the index in one of four position keywords: {{OFFSET}}, {{ORDINAL}}, {{SAFE_OFFSET}}, and {{SAFE_ORDINAL}}. 

{{OFFSET(index)}}: The index starts at zero. Produces an error if the index is out of range.
SAFE_OFFSET(index)}}: The index starts at zero. Returns NULL if the index is out of range.
{{ORDINAL(index)}}: The index starts at one. Produces an error if the index is out of range.
{{SAFE_ORDINAL(index)}}: The index starts at one. Returns NULL if the index is out of range.

These operators are very similar to the existing {{ITEM}} operator currently used to index an array in Calcite. I believe the offset and out of bounds behavior for the existing implementation could be parameterized to support the above operators. 

[Link to BigQuery docs|https://cloud.google.com/bigquery/docs/reference/standard-sql/operators#array_subscript_operator]

I will have a PR open for this in the next day or two, in the meantime any comments, questions, or suggestions are welcome as always. 



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