fix pandas test regression #812

Job	Run time
${{ matrix.os }} ${{ matrix.architecture }} ${{ matrix.linux_archs }}	0s
${{ matrix.os }} ${{ matrix.architecture }}	-6s
${{ matrix.os }} ${{ matrix.architecture }} ${{ matrix.linux_archs }}	-7s
${{ matrix.os }} ${{ matrix.architecture }}	-7s
${{ matrix.os }} ${{ matrix.architecture }}	-8s
	-28s

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