expr: canonicalize round_numeric output to remove negative zero#36655
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`dec::Context::round` preserves the sign bit when a negative fractional value rounds to zero, producing `-0` from e.g. `round(-0.4)`. Numeric row encoding includes the sign bit, so the unmunged result diverges from `0` under bytewise row identity (DISTINCT, UNION, GROUP BY, joins) even though decimal `=` treats them as equal, and the text cast renders the value as `-0`. Run `munge_numeric` after rounding, matching every other scale-changing op in this file. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
antiguru
approved these changes
May 21, 2026
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dec::Context::roundpreserves the sign bit when a negative fractional value rounds to zero, producing-0from e.g.round(-0.4). Numeric row encoding includes the sign bit, so the unmunged result diverges from0under bytewise row identity (DISTINCT, UNION, GROUP BY, joins) even though decimal=treats them as equal, and the text cast renders the value as-0.Run
munge_numericafter rounding, matching every other scale-changing op in this file.