MaxGekk commented on code in PR #56622:
URL: https://github.com/apache/spark/pull/56622#discussion_r3447603488


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sql/api/src/main/scala/org/apache/spark/sql/catalyst/util/SparkDateTimeUtils.scala:
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Review Comment:
   Good catch - done in a9f4569. `truncateTimeToPrecision` now indexes a 
precomputed power-of-ten table instead of calling `math.pow` per value (helps 
the row-converter and cast paths too), and the vectorized `TimeUpdater` hoists 
the factor into its constructor via a `long[]` lookup, so the hot decode loop 
is pure long arithmetic with no per-value `pow`/assert. The factor table's 
length encodes `NANOS_PRECISION`, so the Java side needs no cross-language 
constant.



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