Improvements to RowWithGetter #21634
Description
Various improvements to getValue(fieldIdx) in RowWithGetters mentioned here:]
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Minimize memory overhead of cache using either a index lookup (array) or a single hash map if number of fields exceeds the initial hashmap capacity
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The cache should be checked before calling a getter to avoid any potentially unnecessary conversion in the getter itself.
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Nested rows should be cached, otherwise the cache of such nested rows can't be leveraged.
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Handling of collections / maps / iterables can be significantly improved by simply skipping the transform in all cases where
getValuefor members is the identity transform.
Imported from Jira BEAM-14166. Original Jira may contain additional context.
Reported by: mosche.