[jira] [Created] (BEAM-14166) Improvements to RowWithGetter

["Moritz Mack (Jira)" <ji...@apache.org>]

Moritz Mack created BEAM-14166:
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             Summary: Improvements to RowWithGetter
                 Key: BEAM-14166
                 URL: https://issues.apache.org/jira/browse/BEAM-14166
             Project: Beam
          Issue Type: Improvement
          Components: sdk-java-core
            Reporter: Moritz Mack


Various improvements to getValue(fieldIdx) in RowWithGetters mentioned [here|[https://github.com/apache/beam/pull/16947#discussion_r833602836]:]
 * 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
 * The cache should be checked before calling a getter to avoid any potentially unnecessary conversion in the getter itself.
 * [Nested rows|https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/values/RowWithGetters.java#L111] should be cached, otherwise the cache of such nested rows can't be leveraged.

 * Handling of collections / maps / iterables can be significantly improved by simply skipping the transform in all cases where {{getValue}} for members is the [identity transform|https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/values/RowWithGetters.java#L142]. 



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