[VL] Add Spark randstr function mapping for Velox backend#11607
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Feb 27, 2026
Add expression mapping for Spark's randstr function (Spark 4.0+) to enable offloading to Velox native execution. Changes: - Add RANDSTR constant to ExpressionNames.scala - Add Sig[RandStr] to Spark40Shims and Spark41Shims scalar expression mappings The Velox implementation was merged in facebookincubator/velox#16014. randstr(length, seed) generates a random string of specified length using characters from 0-9, a-z, A-Z.
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What changes were proposed in this pull request?
Add expression mapping for Spark's
randstrfunction (Spark 4.0+) to enable offloading to Velox native execution engine.The
randstr(length, seed)function generates a random string of specified length using characters from 0-9, a-z, A-Z. The Velox implementation was merged in facebookincubator/velox#16014.Changes:
RANDSTRconstant toExpressionNames.scalaSig[RandStr](ExpressionNames.RANDSTR)toSpark40ShimsandSpark41Shimsscalar expression mappingsHow was this patch tested?
Existing Gluten UT framework. The Velox side has comprehensive tests in
RandStrTest.cpp.