fix: coalesce should return correct datatype #317

Job	Run time
macos-14(Silicon)/java 8-spark-3.2/java	36m 44s
macos-14(Silicon)/java 17-spark-3.3/java	35m 9s
ubuntu-latest/java 8-spark-3.4/rust	5m 29s
ubuntu-latest/java 8-spark-3.2/java	45m 24s
ubuntu-latest/java 8-spark-3.4/java	43m 44s
ubuntu-latest/java 8-spark-3.3/java	47m 12s
macos-14(Silicon)/java 8-spark-3.4/rust	5m 16s
ubuntu-latest/java 17-spark-3.4/rust	5m 12s
${{ matrix.os }}/java ${{ matrix.java_version }}-spark-${{ matrix.spark-version }}/${{ matrix.test-target }}	0s
macos-14(Silicon)/java 8-spark-3.4/java	43m 34s
ubuntu-latest/java 11-spark-3.3/java	46m 46s
ubuntu-latest/java 17-spark-3.4/java	44m 32s
macos-14(Silicon)/java 17-spark-3.4/rust	5m 19s
ubuntu-latest/java 17-spark-3.3/java	44m 45s
macos-14(Silicon)/java 17-spark-3.4/java	49m 17s
	7h 38m 23s

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