[CALCITE-6555] RelBuilder.aggregateRex wrongly thinks aggregate funct… #13459

Job	Run time
CheckerFramework (JDK 11)	10m 27s
CheckerFramework (JDK 11), oldest Guava	10m 35s
Linux (JDK 11), Avatica main	12m 43s
Error Prone (JDK 11), latest Guava	4m 0s
Druid Tests	6m 51s
Linux (JDK 11), Pacific/Chatham Timezone	12m 9s
Linux (JDK 21)	10m 28s
Linux (JDK 17)	10m 6s
Linux (JDK 22)	10m 17s
Linux (JDK 8), latest Guava, America/New_York Timezone	11m 53s
Linux (JDK 8), oldest Guava, America/New_York Timezone	10m 40s
Linux (JDK 8) Slow Tests	4m 17s
macOS (JDK 21)	42m 41s
Windows (JDK 17)	15m 21s
Windows (JDK 21)	14m 5s
Windows (JDK 8)	15m 29s
	3h 22m 2s

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