nanjeshramesh opened a new pull request, #20402:
URL: https://github.com/apache/druid/pull/20402

   Fixes #17425.
   
   ### Description
   
   People using Druid's native engine write `CAST(x AS LONG)` because `LONG` is 
the name the native engine uses for its 64-bit integer type. The SQL parser 
only recognized `BIGINT`, so that CAST failed with a parse error even though 
`LONG` and `BIGINT` mean the same thing.
   
   #### Accept LONG as an alias for BIGINT
   
   `LONG` is added to the `SqlTypeName1` production in `Parser.jj` alongside 
`BIGINT`, in the same alternative, so both parse to `SqlTypeName.BIGINT` and 
behave identically (including the existing `UNSIGNED` suffix handling). No new 
`ColumnType` or code path is introduced; `CAST(x AS LONG)` is indistinguishable 
from `CAST(x AS BIGINT)` downstream.
   
   `LONG` is also added to `nonReservedKeywordsToAdd` in `config.fmpp`, 
following the same pattern already used for `OVERWRITE`, `EXTERN`, `IF`, 
`PROPERTIES`, `PROJECTION` and `SEALED`. This keeps `LONG` usable unquoted as 
an ordinary identifier (a column or alias named `long`), so the change is 
additive only.
   
   #### Release note
   `CAST(x AS LONG)` is now accepted as an alias for `CAST(x AS BIGINT)` in 
Druid SQL.
   
   <hr>
   
   ##### Key changed/added classes in this PR
   * `sql/src/main/codegen/config.fmpp`
   * `sql/src/main/codegen/templates/Parser.jj`
   
   <hr>
   
   This PR has:
   
   - [x] been self-reviewed.
   - [x] added documentation for new or modified features or behaviors.
   - [x] a release note entry in the PR description.
   - [x] added or updated tests to cover the new code path 
(`testCountStarWithFilterOnCastAsLong`, `testLongIsUsableAsAnIdentifier` in 
`CalciteQueryTest`).
   


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