[CALCITE-5949] RexExecutable should return unchanged original express… #393

Job	Run time
CheckerFramework (JDK 11), oldest Guava	12m 29s
Error Prone (JDK 11), latest Guava	6m 13s
Linux (JDK 11), Avatica main	18m 27s
CheckerFramework (JDK 11)	15m 5s
Druid Tests	8m 33s
Linux (JDK 11), Pacific/Chatham Timezone	14m 40s
Linux (JDK 17)	14m 5s
Linux (JDK 19)	15m 30s
Linux (JDK 8), latest Guava, America/New_York Timezone	16m 9s
Linux (JDK 8) Slow Tests	0s
Linux (JDK 8), oldest Guava, America/New_York Timezone	16m 41s
macOS (JDK 19)	21m 32s
Windows (JDK 17)	19m 15s
Windows (JDK 8)	27m 35s
	3h 26m 14s

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