[CALCITE-6460] SortRemoveConstantKeysRule fails with AssertionError d… #417

Job	Run time
Windows (JDK 17)	16m 21s
Windows (JDK 21)	17m 51s
Linux (JDK 17)	10m 17s
Linux (JDK 11), Pacific/Chatham Timezone	10m 51s
Linux (JDK 8), latest Guava, America/New_York Timezone	12m 58s
Linux (JDK 8), oldest Guava, America/New_York Timezone	11m 39s
Windows (JDK 8)	16m 42s
Error Prone (JDK 11), latest Guava	3m 57s
Linux (JDK 11), Avatica main	11m 52s
CheckerFramework (JDK 11)	10m 10s
CheckerFramework (JDK 11), oldest Guava	10m 8s
Linux (JDK 22)	9m 53s
Linux (JDK 21)	9m 46s
macOS (JDK 21)	43m 52s
Druid Tests	7m 1s
Linux (JDK 8) Slow Tests	0s
	3h 23m 18s

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