perf: use protobuf for metadata to reduce type conversions #325
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To fix performance issues in #207, the streaming logic switched to using the underlying protobuf objects instead of the
proto-plus
objects which have an type conversion overhead when accessing values. However, the metadata proto was kept in theproto-plus
format. This metadata object contains the type information of the different fields which means it is frequently accessed when iterating over arrays. This causes major performance issues for large scale arrays due to the type conversion overhead. Using the underlying protobuf for the metadata removes this overhead and brings the performance in line withv1.17.1
.Fixes #310