[VL] Spark 4.1: Velox decimal arithmetic does not respect allowPrecisionLoss context (SPARK-53968)

[baibaichen]

Backend

VL (Velox)

Bug description

DECIMAL(38,18) + DECIMAL(38,18) produces a result with incorrect scale (off by 1 digit, i.e., 10x error). Spark 4.1 introduced NumericEvalContext (SPARK-53968) which freezes allowPrecisionLoss=true in expression state. Velox does not correctly receive this context, resulting in decimal scale mismatch.

This is not ANSI-related.

Spark 4.1 only.

Parent issue: #11550

Impact

Suite	Failures	spark40	spark41
GlutenSimpleSQLViewSuite	1	🟢	🔴

Note: GlutenSimpleSQLViewSuite has 2 failures total — the other failure (error condition) is tracked under #11912.

References

• Apache Spark JIRA: SPARK-53968