Full workspace clippy fails in PostgreSQL decimal formatting

[osipovartem]

Describe the bug

On current main, the required full lint command fails in datafusion-sqllogictest when the postgres feature is enabled:

error: this argument is passed by value, but not consumed in the function body
  --> datafusion/sqllogictest/src/engines/conversion.rs:99:37
   |
99 | pub(crate) fn decimal_to_str(value: BigDecimal) -> String {
   |                                     ^^^^^^^^^^
   = note: `-D clippy::needless-pass-by-value` implied by `-D warnings`

To Reproduce

cargo clippy --all-targets --all-features -- -D warnings

Expected behavior

The required workspace lint command succeeds. decimal_to_str only reads the BigDecimal, so it can accept a reference without changing output.

Additional context

Observed on commit 722cbf2e7 with the repository-pinned Rust 1.97 toolchain.