Fix error on show() with an explain plan #313

Job	Run time
build / generate-license	47s
build / lint-python	10s
build / lint-toml	5s
build / lint-rust	24s
build / check-crates-patch	0s
build / ManyLinux x86_64	13m 54s
build / macOS arm64 & Windows (3.10, macos-latest)	7m 42s
build / ManyLinux arm64	9m 11s
build / macOS arm64 & Windows (3.10, windows-latest)	9m 40s
build / Source distribution	0s
build / build-macos-x86_64	0s
build / Build docs	51s
build / Merge build artifacts	0s
test / test-matrix (3.11, stable)	3m 59s
test / test-matrix (3.12, stable)	4m 3s
test / test-matrix (3.13, stable)	4m 4s
test / test-matrix (3.10, stable)	4m 10s
test / test-matrix (3.14, stable)	3m 52s
	1h 2m 52s

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