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Yibo Cai commented on ARROW-17601: ---------------------------------- Will look into this issue. Thanks [~npr] for the report. > [C++] Error when creating Expression on Decimal128 types: precision out of > range > -------------------------------------------------------------------------------- > > Key: ARROW-17601 > URL: https://issues.apache.org/jira/browse/ARROW-17601 > Project: Apache Arrow > Issue Type: Bug > Components: C++ > Reporter: Neal Richardson > Priority: Major > > Reproducer in R: > {code} > library(arrow) > library(dplyr) > tab <- Table$create(col1 = 1:4, col2 = 5:8) > tab <- tab$cast(schema(col1 = decimal128(33, 4), col2 = decimal128(15, 2))) > tab %>% mutate(col1 * col2) > # Error: Invalid: Decimal precision out of range [1, 38]: 49 > # /Users/me/arrow/cpp/src/arrow/compute/kernels/scalar_arithmetic.cc:1078 > DecimalType::Make(left_type.id(), precision, scale) > # /Users/me/arrow/cpp/src/arrow/compute/exec/expression.cc:413 > call.kernel->signature->out_type().Resolve(&kernel_context, types) > {code} > We don't have this problem integers and floats (see comment below). For > consistency with the other arithmetic functions, what I would expect would be > that we would expand the precision as much as we could within Decimal128–in > this case, Decimal128(38, 6)–and the compute function would either error _if_ > there is an overflow (in the _checked version) or just overflow in the > non-checked version. But it wouldn't error on determining the output type. -- This message was sent by Atlassian Jira (v8.20.10#820010)