PromQL: math/trig scalar-transform functions (abs/ceil/floor/clamp/ln/…) unsupported #45

Summary

Math / trig scalar-transform functions parse but are rejected (UnsupportedFunction): abs, ceil, floor, round, exp, ln, log2, log10, sqrt, clamp/clamp_min/clamp_max, sgn, the sin/cos/tan/asin/… trig family, pi, rad, deg.

Corpus impact

81 rejections (4.2%).

Examples

abs(-1 * http_requests{job="api"})
floor(0.004 * http_requests{job="api"})
clamp_max(go_goroutines, 5)

Notes

• Error variant: LoweringError::UnsupportedFunction.
• These are per-sample element-wise scalar transforms — needs a scalar-transform node in the L2 PromQL path (related to the missing scalar/literal operand tracked by QueryExpr::BinaryOp has no scalar/literal operand — vector-op-scalar PromQL rejected #35).