andygrove commented on PR #5496:
URL: 
https://github.com/apache/datafusion-comet/pull/5496#issuecomment-6238017030

   Following up on my earlier comment, I checked each ask against the current 
branch and all of them are in:
   
   - Dictionary coverage: `DirectColumnarToRowConverterSuite` now builds 
dictionary-encoded vectors directly and runs compact and wide decimals through 
them, byte-compared with `UnsafeProjection`.
   - Early-exit and memory trade-offs: the tuning guide now covers both the 
`LIMIT` cost of the fixed-width path and the per-task `batchBuffer`, with the 
6.7 MB example.
   - `changePrecision`: `compactDecimalValue` and `writeWideDecimal` both 
document why that check is skipped.
   
   I merged current `main` into the branch (only conflict was 
`CometUnsafeProjection` from #6858 in `convertBatches`) and re-ran both suites 
against a debug native build: 11 passed. Nothing else outstanding from me.


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