cockroachdb / cockroachdb/cockroach

sql: support ORDER BY INDEX in aggregate decoration clauses

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C-enhancement T-sql-queries
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Description

Support ORDER BY INDEX in aggregate decoration clauses such as:

```
SELECT percentile_disc ( 0.50 ) WITHIN GROUP ( ORDER BY PRIMARY KEY tbl ) FROM tbl;
SELECT percentile_disc ( 0.50 ) WITHIN GROUP ( ORDER BY INDEX_AFTER_ORDER_BY_BEFORE_AT INT . LIKE @ FAMILY);
```

Jira issue: CRDB-31119

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