panic at `attempt to multiply with overflow` when doing math on Decimal128 columns

[kmitchener]

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When changing the TPC-H tests to use Decimals, getting panics with this error:

thread 'sql::subqueries::tpch_q17_correlated' panicked at 'attempt to multiply with overflow', datafusion/physical-expr/src/expressions/binary/kernels_arrow.rs:359:61

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See #3393 for additional examples where the overflow happens on benchmark queries.

[kmitchener]

When fixed, pls un-ignore test tpch_q17_correlated() in core/tests/sql/subqueries.rs