eldenmoon commented on PR #70359:
URL: https://github.com/apache/doris/pull/70359#issuecomment-6703594059

   Local validation on a 4.2 FE+BE build:
   
   - BE red/green: before this commit, `WHERE CAST(v AS INT) IS NULL` and `<=> 
NULL` return no rows while the projection returns `0,1,1`; after it, both 
return the rows whose cast result is NULL and `IS NOT NULL` returns the other 
row.
   - Regression locally: `test_variant_cast_isnull_pushdown` (new), 
`test_variant_cast` (`cast.groovy`) and `test_variant_cast_strict_mode` all 
pass.
   - The 4.1-only `test_variant_cast_nullable` from #70363 is intentionally not 
used here: `CAST('{"a":1}' AS INT)` is 0 on 4.1 and NULL on 4.2, so that golden 
is branch-specific. The new case only uses string/array values, whose cast is 
NULL on both branches.
   


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