[CALCITE-6338] RelMdCollation#project can return an incomplete list o… #399

Job	Run time
CheckerFramework (JDK 11)	10m 9s
Error Prone (JDK 11), latest Guava	4m 11s
CheckerFramework (JDK 11), oldest Guava	9m 57s
Linux (JDK 11), Avatica main	11m 40s
Druid Tests	6m 57s
Linux (JDK 11), Pacific/Chatham Timezone	10m 20s
Linux (JDK 17)	9m 44s
Linux (JDK 19)	10m 52s
Linux (JDK 8), latest Guava, America/New_York Timezone	11m 30s
Linux (JDK 8), oldest Guava, America/New_York Timezone	9m 52s
Linux (JDK 8) Slow Tests	0s
Windows (JDK 17)	13m 38s
macOS (JDK 19)	15m 37s
Windows (JDK 8)	15m 22s
	2h 19m 49s

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