Eliminate nullability errors from :sdks:java:extensions:sql:perf-tests
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Description
Just remove the suppression of nullness warnings and fix some errors!
Imported from Jira [BEAM-10620](https://issues.apache.org/jira/browse/BEAM-10620). Original Jira may contain additional context.
Reported by: jayendra13.
Subtask of issue #20497
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