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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