fix explain tests for testFilterPushDownExplain #206

Job	Run time
build-windows-macos (macos-14, 21, integration)	18m 30s
Get-CI-Image-Tag / Get-CI-Image-Tag	6s
build-windows-macos (windows-latest, 25, -PbuildPlatform=windows, unit)	11m 46s
build-windows-macos (windows-latest, 21, -PbuildPlatform=windows, unit)	13m 0s
build-windows-macos (windows-latest, 21, -PbuildPlatform=windows, integration)	22m 3s
build-windows-macos (macos-14, 25, unit)	6m 59s
build-windows-macos (macos-14, 21, doc)	4m 35s
build-windows-macos (macos-14, 21, unit)	6m 23s
build-windows-macos (windows-latest, 25, -PbuildPlatform=windows, integration)	19m 33s
build-windows-macos (macos-14, 25, integration)	13m 36s
build-windows-macos (macos-14, 25, doc)	3m 40s
bwc-tests-rolling-upgrade (25)	2m 53s
build-linux (21, unit)	10m 50s
bwc-tests-rolling-upgrade (21)	2m 48s
build-linux (25, unit)	9m 43s
bwc-tests-full-restart (25)	4m 41s
build-linux (25, doc)	5m 42s
bwc-tests-full-restart (21)	4m 46s
build-linux (25, integration)	15m 30s
build-linux (21, doc)	5m 37s
build-linux (21, integration)	15m 55s
	3h 18m 36s

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