refactor: Eliminate unnecessary cast to StringType #16

Job	Run time
ubuntu-latest/java 8-spark-3.4/rust	5m 45s
ubuntu-latest/java 8-spark-3.2/java	45m 47s
ubuntu-latest/java 8-spark-3.3/java	46m 8s
ubuntu-latest/java 8-spark-3.4/java	45m 17s
ubuntu-latest/java 11-spark-3.3/java	45m 24s
ubuntu-latest/java 11-spark-3.4/rust	5m 26s
ubuntu-latest/java 17-spark-3.3/java	44m 59s
ubuntu-latest/java 11-spark-3.4/java	46m 16s
ubuntu-latest/java 17-spark-3.4/rust	5m 25s
ubuntu-latest/java 17-spark-3.4/java	44m 55s
macos-14(Silicon)/java 8-spark-3.4/rust	3m 58s
macos-14(Silicon)/java 8-spark-3.4/java	37m 9s
macos-14(Silicon)/java 11-spark-3.4/rust	4m 0s
macos-13/java 8-spark-3.4/rust	9m 43s
macos-14(Silicon)/java 11-spark-3.4/java	38m 31s
macos-13/java 8-spark-3.4/java	1h 0m 41s
macos-14(Silicon)/java 17-spark-3.4/rust	5m 42s
macos-13/java 11-spark-3.4/rust	7m 5s
macos-14(Silicon)/java 17-spark-3.4/java	29m 53s
macos-13/java 11-spark-3.4/java	1h 13m 57s
macos-13/java 17-spark-3.4/rust	9m 58s
macos-13/java 17-spark-3.4/java	1h 4m 0s
macos-14(Silicon)/java 8-spark-3.2/java	28m 54s
macos-14(Silicon)/java 17-spark-3.3/java	39m 12s
	12h 28m 5s

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