* SQL Expressions: Allow many more functions and nodes
* Also allow the `REGEXP_SUBSTR` function
* Add window functions
* add more JSON support, remove now and current time (for now)
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Co-authored-by: Kyle Brandt <kyle@grafana.com>
* SQL Expressions: Add Null-literal node
* Retain some order in the code - put NullVal with BoolVal
* Add support for `IN` keyword
* Add GROUP_CONCAT keyword
* Add COLLATE keyword
From Claude:
The test case demonstrates a simple use of COLLATE with a string
literal, but in real MySQL queries, COLLATE is often used in more
complex scenarios like:
1. String comparisons:
`SELECT * FROM table WHERE name COLLATE utf8mb4_bin = 'John'`
2. Sorting:
`SELECT * FROM table ORDER BY name COLLATE utf8mb4_unicode_ci`
3. JOINs:
`SELECT * FROM table1 JOIN table2 ON table1.name COLLATE utf8mb4_bin = table2.name`
The COLLATE clause is particularly useful when you need case-sensitive
comparisons (utf8mb4_bin) or specific language-aware sorting rules.
* SQL Expressions: Add CASE/WHEN SQL nodes to allowlist
* Fixed and test for functions added in #102011
* Add remaining functions to the test-case
These are mostly aliases, so the LLM chose to omit them originally.
But adding now for completeness
* Fix ordering of allowed nodes
* Under feature flag `sqlExpressions` and is experimental
* Excluded from arm32
* Will not work with the Query Service yet
* Does not have limits in place yet
* Does not working with alerting yet
* Currently requires "prepare time series" Transform for time series viz
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Co-authored-by: Sam Jewell <sam.jewell@grafana.com>
