[CALCITE-6699] Invalid unparse for Varchar in StarRocksDialect #14455

Job	Run time
Windows (JDK 8)	18m 10s
Windows (JDK 17)	14m 45s
Windows (JDK 21)	15m 57s
Linux (JDK 8, oldest Guava, America/New_York Timezone)	10m 50s
Linux (JDK 8, latest Guava, America/New_York Timezone)	12m 26s
Linux (JDK 11, Pacific/Chatham Timezone)	10m 23s
Linux (JDK 21)	10m 6s
Linux (JDK 11, Avatica main)	14m 51s
Linux (JDK 17)	10m 31s
Linux (JDK 23)	12m 9s
CheckerFramework (JDK 11)	10m 42s
macOS (JDK 21)	34m 55s
CheckerFramework (JDK 11, oldest Guava)	11m 7s
ErrorProne (JDK 11, latest Guava)	4m 8s
Druid Tests	6m 53s
Linux (JDK 8) Slow Tests	0s
	3h 17m 53s

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