Matt DePero created ARROW-16983:
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Summary: Delta byte array encoder broken due to memory leak
Key: ARROW-16983
URL: https://issues.apache.org/jira/browse/ARROW-16983
Project: Apache Arrow
Issue Type: Bug
Components: Go, Parquet
Reporter: Matt DePero
The `DeltaByteArrayEncoder` has a memory leak due to a bug in how
`EstimatedDataEncodedSize` is calculated. DeltaByteArrayEncoder extends
`encoder` which calculates EstimatedDataEncodedSize by calling `Len()` on its
`PooledBufferWriter` sink. DeltaByteArrayEncoder however does not write data to
sink, instead writing data to `prefixEncoder` and `suffixEncoder` causing
EstimatedDataEncodedSize to always return zero.
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