fix: Average expression in Comet Final should handle all null inputs … #586

Job	Run time
ubuntu-latest/java 8-spark-3.2/java	45m 47s
macos-14(Silicon)/java 8-spark-3.4/rust	4m 11s
ubuntu-latest/java 8-spark-3.3/java	47m 32s
ubuntu-latest/java 8-spark-3.4/rust	5m 48s
macos-14(Silicon)/java 8-spark-3.4/java	31m 2s
ubuntu-latest/java 11-spark-3.3/java	47m 50s
ubuntu-latest/java 8-spark-3.4/java	45m 15s
macos-14(Silicon)/java 11-spark-3.4/rust	4m 18s
ubuntu-latest/java 17-spark-3.3/java	47m 26s
ubuntu-latest/java 11-spark-3.4/rust	5m 53s
macos-14(Silicon)/java 11-spark-3.4/java	42m 29s
ubuntu-latest/java 11-spark-3.4/java	47m 0s
macos-14(Silicon)/java 17-spark-3.4/rust	4m 18s
ubuntu-latest/java 17-spark-3.4/rust	5m 39s
macos-14(Silicon)/java 17-spark-3.4/java	32m 36s
ubuntu-latest/java 17-spark-3.4/java	44m 24s
macos-14(Silicon)/java 8-spark-3.2/java	32m 50s
macos-13/java 8-spark-3.4/rust	7m 15s
macos-14(Silicon)/java 17-spark-3.3/java	37m 12s
macos-13/java 8-spark-3.4/java	1h 1m 9s
macos-13/java 11-spark-3.4/rust	7m 25s
macos-13/java 11-spark-3.4/java	1h 1m 36s
macos-13/java 17-spark-3.4/rust	7m 19s
macos-13/java 17-spark-3.4/java	1h 3m 25s
	12h 19m 39s

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